Gen if stata

Gen if stata. See[D] egen for more Hello STATA Experts: I am trying to create a new variable based on the existence of certain conditions in two existing variables (see code below). So, to create the variable you seem to want, you'll want to use the generate command (usually abbreviated gen): gen case_id = _n I I'm having trouble getting this to generate. The year is only two digits. foreach var of varlist _all { 2. This time type labels with double quotes Forums for Discussing Stata; General; You are not logged in. 4 A 2020 1 0. > > What i would like to do is the following: > > local a= 1 if `b' > `c' > > local a= 2 if `b' < = `c' * * For searches and help try: * http Stata codes missing values (. If a replace command has an if condition, observations where the if condition is not true will be left unchanged. com pctile — Create variable containing percentiles DescriptionQuick startMenu SyntaxOptionsRemarks and examples Stored resultsMethods and formulasAcknowledgment Also see Description pctile creates a new variable containing the percentiles of exp, where the expression exp is typically just another variable. 13. 9c041f7ed8d33X+000 +1. drop would then do nothing. xtile creates a new variable that categorizes Stata has many mathematical, statistical, string, date, time-series, and programming functions. Follow edited Dec 10, 2015 at 6:51. We can make use of the “*” wildcard to indicates that we wish to use all the variables. Let us illustrate with the simplest example, computing the number of distinct In the following command, Stata will start from the second observation from the last one (as indicated by -2) and go up till the fifth observation from the last one (as indicated by -5). -st_matrix("M")- will return whatever is in your stata matrix M. if (eczema == 1) // age<25 is an expression, and Stata evaluates it; returning 1 if the statement is true and 0 if it is false. dta to mydata1. Essentially, I have a load of string values for one variable and I want to recode these so that all except a particular value I am trying to create dummy variables in Stata that are 1 if any of the variables dx1 through dx25 start with a specific string. Stata 5: How do I create a lag variable? Title Stata 5: Creating lagged variables Author James Hardin, StataCorp Create lag (or lead) variables using subscripts. If you look carefully at the results above, you'll see that when I selected a single line to run, it was copied into a temporary do-file and run, so even though both lines are in the same window in the do-file editor, they are run as separate do-files, and local gen seq2 = mod(_n-1,6) + 1 It is valuable to experiment with the mod() function to see what results can be obtained. Skip to the content following this video. Stata indicates "time variable: Year, 1986 to 2012, but with gaps") Hi, It's my first time using stata and I wanted to know how creating binary variables is possible. However, when gegen total is combined with by(), gegen seems to look looks at Go to stata r/stata • by tostring industry_code, gen(ind_str) gen industry_2_digit = substr(ind_str, 1, 2) Mine is spiritually the same as the other reply. Page of 1. I've looked through the help command, Stata forum, and online PDF instructions. 3 if exp) evaluates exp. Best, Sergiy On Fri, Aug 2, 2013 at 2:05 PM, Joseph Kwan < [email protected]> wrote: > I would like to generate a variable for people older than 25 years > old, > > so I use > > gen old=1 if age>25 split can be useful when input to Stata is somehow misread as one string variable. Stata Journal 13: 217–219. 2. It appears to be dropping most . Equivalent for I now realized that if we want STATA to deal with time we have to convert the string variable representing date into "STATA internal form" (count of seconds, days, months or years from 1960) first and then if necessary, change Basically I'm trying to extend this question: Stata: I've tried bysort cik year: gen sub_num = _N if loan_amt != 0 and bysort cik year loan_amt: gen sub_num = _N but neither really does it. 37k 6 6 gold badges 34 34 silver badges 50 50 bronze badges. list, sepby(id) This works, even in the presence of missing values of bp, because such missing values are placed last within arrangements, regardless of the direction of the sort. Let's use recode again to create a new variable named hisbp2. a, . It is not relevant for more recent versions. To achieve the desired result, we must give three commands: capture The Stata Documentation consists of the following manuals: [GSM] Getting Started with Stata for Mac [GSU] Getting Started with Stata for Unix [GSW] Getting Started with Stata for Windows [U] Stata User’s Guide [R] Stata Base Reference Manual [ADAPT] Stata Adaptive Designs: Group Sequential Trials Reference Manual [BAYES] Stata Bayesian Analysis Reference Manual Note that all your dummies would be created as 1 or missing. drop _all. dta_1. set obs 100 Number of observations (_N ) was 0, now 100. This website uses cookies to provide you with a better user experience. forvalues i=1/4 { local x : word `i' of x Stata’s definition of a matrix includes a few details that go beyond the mathematics. 2011. . There is some history there. Best wishes Tim -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Nick Cox Sent: 01 September 2011 11:17 To: [email protected] Subject: Re: st: Integer values in Stata There are naturally other ways to do it. ? 0. Consider one of the following: . You can find all of these documented in the Stata Functions Reference Manual. Two elements are immediate. Stata Journal 11: 321–322. info() OR df. For example, in the data extract at the bottom of this post, the North East region has 6 people employed & 0 unemployed. I've tried Thanks Nick. That’s okay: Stata will assume the seconds should be zero. ; count if <condition> for individual 1 and 2, because they are both promoted (id1: from occupation 1 to 2; id2: from occupation 2 to 4) during the sample period, so they are catogorized as "promoted" group, and 3 is not promoted during this time, so it is catogorized as "non-promoted" group. b, . But even if you know that code is correct, I would never overwrite the original variable in problems like this. gen xbig = (x > 1000) The first statement keeps all the observations for which x > 1000 or x is missing. It is almost always more useful to create them directly as 1 or 0. Created Date: 6/8/2013 1:45:06 PM I don't see where the type mismatch comes from in your code. See [U] 23 Combining datasets for a comparison of append, merge, and joinby. We initialize the variables we want . c, , . com summarize — Summary statistics DescriptionQuick startMenuSyntax OptionsRemarks and examplesStored resultsMethods and formulas ReferencesAlso see Description summarize calculates and displays a variety of univariate summary statistics. Its comprehensive suite of statistical tools, including leading ANOVA and REML, ensures trustworthy results even for the most intricate research questions. You can browse but not post. bysort group (year) : gen time = _n That is, for this to make sense, some other variable must be available to indicate the order _within_ groups. replace var2 = 'Y' if Home / Resources & support / FAQs / Stata 5: Creating lagged variables. You then use one of the string-to-numeric conversion functions to convert the string to an Welcome to my classroom!This video is part of my Stata series. A series where I help you learn how to use Stata. However, dyngen works observation by observation. ly/statacoursefilesDisclaimer: I used to work with S I'm a SAS user new to Stata. Create unique personal id. gen lag2 = x[_n-2] . If you do have weights, the line of thought is the same but you will have to play around with the other -egen- functions. dta (called the using dataset), matching on one or more key variables. If you want a more complicated rule, you may find yourself reaching for egen functions rowtotal(), rowmiss(), and so forth. 28 Apr 2022, 07:30. Use 20Y to tell Stata to assume it’s 2023 rather than 1923. Stata commands that work with the by prefix indicate this immediately following their syntax diagram by reporting, for example, What I want know, is to calculate a fiscal month by the using the idea in the code above. Post Cancel. i. Any arithmetic operation on a missing value or an impossible arithmetic operation (such as Title stata. Here, we get summary statistics for price for cars with repair histories of 1 or 2. Please do read and act on FAQ Advice #12. The variable dup for the last observation of the respective group you refer to (observation 4) states there are two observations that are the same:. Each type is discussed below. So the mean edu is (3*4+5*3)/7 for You need to tell Stata to ignore it by putting # in the mask between minute and month, meaning the element there should be ignored. mi copy newname As usual we would recomand you to stay with the Stata command D. Below is a simplified version of the code that will yield the I tried this but it doesnt work: gen dummy=1 if k* invalid syntax r(198); regards, Gaby --- On Fri, 1/16/09, Jeph Herrin <[email protected]> wrote: > From: Jeph Herrin <[email protected]> > Subject: Re: st: comparing dates: keep if dates<d(DDMMYYYY) > To: [email protected] > Date: Friday, January 16, 2009, 10:09 AM > You asked Stata to generate a variable if a condition From Shehzad Ali < [email protected] > To "[email protected]" < [email protected] >Subject Re: st: indicator for "if cell contains the word or phrase" Date Sun, 16 Sep 2012 19:27:16 +0100 (BST) The subscript [_n] is harmless but vacuous here as referring to the current observation. We can similarly explore the data using marginsplot after mean with The important thing to keep in mind is that local macros vanish when the do-file within which they were created ends. 69314718 1 x = It would be easier to follow your problem if you gave a very simple worked example. 1. Join Date: Mar 2014; Posts: 34625 #7. 5) return list local i = 1 foreach n of numlist 0. The values of the variable are specified by =exp. Dear Carlo Lazzaro, Nick Cox, Clyde Schechter Hi, I am New to this site as well as new to Stata. sysuse auto local vlist "var1 var2 mpg var3" foreach var of local vlist { capture confirm variable `var' if !_rc { local first_present "`var'" continue, break // <-- stops the loop after the first present variable } } if "`first_present'" != "" { di as txt "The first present Stata Journal readers can find a self-contained tutorial on by (Cox 2002). Not realizing this will produce, almost always, a puzzling bug. About; Products OverflowAI; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine Remarks and examples stata. I will just add that Philipp's code generates missing where the condition is not met and these would have to be replaced with 0 to make it a dummy variable. recode— Recode categorical variables 3 Remarks and examples stata. If your variable names don't have numbers in them then you probably want a single loop using extended macro functions to reference multiple lists containing the actual variable names. recode paradversity (. Panel Data with three identifiers. Generating panel data in Stata. On the other hand, if you really do want testing in terms of the Title stata. You say place and Place in different places, but you don't give us a data example to make clear what is going on. g. _pctile Return, percentiles( 0. Remember that Stata commands do either exactly what you say or nothing at all. com Example 1 set obs can be useful for creating artificial datasets. If you are new to Stata we strongly recommend reading all the articles in the Stata Basics section. For instance, if we wanted to graph the function y = x2 over the range 1–100, we could type. You've said that your stata matrix is Tx10, so that's what you'll get. ) You can't insert loops in if qualifiers. They could be applied with single variables, but their use to calculate single maxima or minima is Stata’s %ty format records years as numeric values, and it codes them the natural way: rather than 0 meaning 1960, 1960 means 1960, and so 2006 also means 2006. The variables are hospitalid : unique hospital id emrvendor: name of emr software emrfunctions: name of application rural: if hospital is located in rural area =1 otherwise =0 Hospitals can utilize different EMR vendors for different emrfunctions. Assuming you created an SFS folder while reading Managing Stata Files, go to that folder and create a new do file called Question: I have a variable that I can tabulate to get the frequencies and percent and cumulative percent frequencies of its different values, but what I really want to see are the cumulative frequencies. com Remarks are presented under the following headings: What’s an expression Assignment suppresses display, as does (void) The pieces of an expression Numeric literals String literals Variable names Operators Functions What’s an expression Everybody knows what an expression is: expressions are things like 2+3 and invsym(X’X)*X’y. 7 Stata 变量生成与替换. In this section we will see how to compute variables with generate and replace. As I say, I think with these particular definitions of A, B, and C, this isn't a problem. You may need to go back to it. Load the auto dataset. The reason why I changing month is that when I take into account fiscal month, the listing of months (1 st, 2 nd, etc) is going to change, depending on the beginning month of the fiscal year. I want to generate a new variable x that is equal to 5 if price belongs to a list of values. decode state, gen(st) (make a string variable) drop state (discard the encoded variable) sort st (sort on string) merge 1:1 st using first (merge the data) Reference Schechter, C. i. Here df. ageg i. At its very simplest, this could be just sort var1 gen var2 = _n but -if- or -in- qualifiers, missing values and tied values could mess things up. For each group, as determined by the variables used with the by prefix, if there is more than one observation, the count starts at 1 (see help _n). I just noticed this example has Stata’s if command, in short, is quite different from Stata’s if qualifier. I am very new to Stata, so all your explanations are really helpful to understand the mechanism behind the commands. Stata tip 99: Taking extra care with encode. The rowmean() function of egen calculates the mean of the values in each row, ignoring any missing values. Cox, N. 2[U] 27 Commands everyone should know Data manipulation gen age1 = inrange(age,20,24) Note that it will return 1 for the endpoints of the range, 20 and 24. The opposite dummies are one of the things that seems inelegant about it, but I found that I did need to use them: with a single dummy, the count() function of egen counts the 0s as well as 1s. teffects psmatch determines how near subjects are to by CODE, sort: egen m = min(real(newdate1)) would seem to be an alternative. %PDF-1. In this problem, however, egen is not needed any way and the loop looks wrongly placed too. Now our main loop is to cycle through the values of pid, which by construction contains integers 1 and above. * Example generated by -dataex-. use https://www. But here's mine anyway. I would like to create an indicator variable DIBP that takes a value of 1 if the same drug was supplied during both period 1 and period 2 of a given year, and zero otherwise. See var3 below for an example. Cox and G. It seems that when subscripting a variable in Stata with [_n-1], egen assumes the 0th observation is missing (var[0]=""). com Remarks are presented under the following headings: Simple examples Setting up value labels with recode Referring to the minimum and maximum in rules Recoding missing values gen newvariable = var1 + var2 + var3 if dum1==1|dum2==1|dum3==1 David -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Gauri Khanna Sent: 27 April 2006 15:03 To: [email protected] Subject: st: simple question: generating variables using the if / or command Dear Stata list, I have a seemingly simple Stata can also join observations from two datasets into one; see[D] merge. Gen indicator variable if greater than a particular date 08 Oct 2024, 05:51 . Time. And the minimum and maximum values of sbp are 122 and 720, respectively, for category "1" of hisbp. 切换模式. So the condition is just equivalent to rep78 != rep78 or rep78[_n] != rep78[_n]-- which is never true and so no observations satisfy the condition and the mean is returned as missing. See > 文章目录stata中变量生成命令：gen和egengenegen按照变量分组egen注意区别gen和egen stata中变量生成命令：gen和egen egen 和 gen 都用于生成新变量，但egen 的特点是它更强大的函数功能。gen 可以支持一些函数， egen 支持额外的函数。 如果用 gen 搞不定，就得用egen想办法了。 Here is the Stata 11 ver Skip to main content. So the mean edu is (3*4+5*3)/7 for Remarks and examples stata. One thing that it does do automatically is create a variable _n that contains the observation number or record number. It would not drop var1 and var2. The observations that fall in this range will get a value of 1. 3. Note that Python does not have value labels like Stata does. describe var: df['var']. Generate Group ID with 2 conditions in Stata. It is probably simplest for you to repeat import excel or import delimited and flag that the first row of the data file is to be treated as indicating variable names. > > -tabulate x, generate()- is another way to create indicator variables. Meanwhile, I noticed that someone has already submitted another solution. stata-press. If Stata were to ask me if I want to skip or overwrite it if the variable is already there, that would be great. > -egen x, group(a b)- can be useful. In essence the nearest simple equivalent is 生成虚拟变量的方法，一共3种。gen 和 replace 命令一起用。首先，用【codebook qa301】查看原数据中，“现在的户口状况”赋值情况。 然后，用gen对"qa301==3(非农业户口)"赋值为“1”；再用“replace”代 Stata does very little automatically. Thanks Nick all worked a treat. 0. by family (person), sort: gen pid = _n We need to map fatherm and motherm to consistent identifiers. Quinton Sent: 07 August 2006 16:31 To: [email protected] Subject: st: tabulate with gen Hello - I use tab foo, gen(foo_) all the time to create dummy variables based on the values of foo - I get foo_1, foo_2, etc. The difference between gen and egen in terms of dealing with missing values is that gen treats missing values as the largest possible value, while egen has various options to handle missing values depending on the function used. In the latter case, if the string All Stata commands (or nearly) can be accompanied by an if clause. All Time Today Last Week Title stata. stata ; Share. Note that this will work too: gen emonth1=mofd(date(dates, "MDY")) Note also -- and this is not widely known -- that -daily()- is a synonym for -date()-. display " `var' " _col(20) "`: type `var''" 3. levelsof x, hexadecimal +1. Stata follows the existing sort order when using -generate- or -replace-. gen I faced an issue using if with value labels. I just noticed this example has matrix with the elements h11 h21 that I just generated. Let’s use the auto data for our examples. I am searching similar queries as mine on different groups and trying the commands suggested there, but without an understanding of the logic behind them. , . generate x = _n. 2024 State General Election Saturday, 26 October 2024. Thinking furter: as I want to repeat the last block of codes for patiens who had multiple scans (for instance 6 scans per patient, all coded as: scandate1, scandate2, and so on) would a foreach or forvalues loop be a time-saving way to let STATA . If you look carefully at the results above, you'll see that when I selected a single line to run, it was copied into a temporary do-file and run, so even though both lines are in the same window in the do-file editor, they are run as separate do-files, and local Note that there are exactly two observations for sic2=10 and year=2009, and the largest of the two is 89,329. com Propensity-score matching uses an average of the outcomes of similar subjects who get the other treatment level to impute the missing potential outcome for each subject. ; count if <condition> Remarks and examples stata. 登录/注册. If you are doing a computation only on a single variable that relies only on its own lagged values or those of other variables, you do not need dyngen because generate and replace work their way through the data All Stata commands (or nearly) can be accompanied by an if clause. Stata’s matrix programming language, Mata, provides more functions and those are Here is an example on how to find the first variable name present in the data in a list of potential variable names. Login or Register by clicking 'Login or Register' at the top-right of this page. On the other hand, if you really do want testing in terms of the The tag() function of egen goes back a long way in Stata (1999) and just encapsulates a longer-standing trick that I guess is in the manuals somewhere and/or was discussed on Statalist in the 1990s (all the old posts have disappeared). I generally prefer making a new variable. =1) if parmental==0 & parcrim==0 recode paradversity (. 360 1017 1 360 1017 2 Remarks and examples stata. Now I'd like to know the mean education level for both groups. gen long p = . -egen, group()- is only going to produce an equivalent result if there are no ties. I've left my failed count variables in the examples for reference. ageg _Iageg_2-7 (naturally coded; _Iageg_2 omitted I created a new variable from the mean of another variable using egen: egen afd_lr2 = mean(afd_lire2w) if ost == 0 Now I would like to replace the values with the mean of another variable if ost Stata commands that work with the by prefix indicate this immediately following their syntax diagram by reporting, for example, "by is allowed; see [D] by" or "bootstrap, by, etc. We also need an understanding that true and false conditions evaluate numerically to 1 and 0, respectively, which is also explained in the tutorial just cited and in the FAQ: What is true and false in Stata?. com When working with binary strings, one can find the first or last location of the binary 0 using strpos(s, char(0)) or strrpos(s, char(0)). The median cannot possible by 95,388 as you assert Excel reported, since that is larger than the largest value in the data. If the result is true This will prevent Stata from and-ing the last term of A with the first term of B rather than and-ing all of A with all of B. So you would need to drop or rename any previous result with the same variable name as that you want to use in an egen command. You probably want > this: > > if `b' > `c' local a= 1 Laurie Molina ===== > > I want to set the value of a local variable, > > conditional of the value of some other variable, but > > i think the option "if" is not availabe for a local > > variable. The dataset attached is malformed for Stata purposes as metadata appear in the first observation and as a side-effect all variables are string. year month X Y weight 2013 1 1 0 1000 2001 12 0 1 2000 I want to create a variable Z based on the X and Y variables, conditional on year. matrix list A A[3,2] c1 c2 r1 1 2 r2 3 4 r3 5 6 Here we . Stata tip 114: Expand paired dates to pairs of dates. I have two formulas for year before and after 2002. Ernest Berkhout SEO Amsterdam Economics University of Amsterdam Room 3. gen ecobuy = 1 if ecolbs > 0 & ecobuy = 0 if ecolbs = 0. 1 like; Comment. So, a household will belong to the category of "single mothers" IF one . 4 A 2020 2 0. In particular, Stata 14 includes a new default random-number generator (RNG) called the Mersenne Twister (Matsumoto and Nishimura 1998), a new function that generates random integers, the ability to generate random numbers from an interval, by using standard Stata commands, but do that by mi m. Brendan. We can similarly explore the data using marginsplot after mean with This is difficult to answer until you explain clearly (1) which variables are numeric with value labels and which string ("alphanumerical format" has no Stata meaning otherwise) (2) whether Record_2/20 != U07. for individual 1 and 2, because they are both promoted (id1: from occupation 1 to 2; id2: from occupation 2 to 4) during the sample period, so they are catogorized as "promoted" group, and 3 is not promoted during this time, so it is catogorized as "non-promoted" group. gsort— Ascending and descending sort 3 Technical note Assume that we have a dataset containing x for which we wish to obtain the I couldn't resist the temptation to try this -- to revisit a program that I did as a teenager, writing in Stata this time. The ATE is computed by taking the average of the difference between the observed and potential outcomes for each subject. z) larger than any nonmissing values, so, literally, x >1000 is true. Consider this reproducible example: As in #2 what you want is not a conversion between %tm and numeric because that wording confuses a display format and a storage type, more broadly a group of storage types. help max(). :+ 31 20 525 1657 fax:+ 31 This website uses cookies to provide you with a better user experience. Quick Stata provides mathematical functions, probability and density functions, matrix functions, string functions, functions for dealing with dates and time series, and a set of special functions for programmers. Stata commands that work with the by prefix indicate this immediately following their syntax diagram by reporting, for example, If you have a lot of variables in the dataset, it could take a long time to type them all out twice. jpg New Variable from Existing Variables. gen Thanks Marcos. Typing summarize age if gen VALID = inlist(V, "1R3", "1R6", "2R3", "2R6") replace VALID = . But if you wanted to use a numeric version of -newdate1- later, using -destring- would be gen typfreq_rel = typfreq/totalfreq This is if you have no weights. fgzfgz Ronnie, try if "$member" == "jane" { assert memid == 10201 } else if "$member" == "john" { assert memid == 10101 } Note the double quotes. PS - what do you want to do if x==5? C. I know I could do this in two separate lines, but that seems inefficient, especially because I have many lines of similar code. It is not. } x = . 6 A 2020 2 0. Results Event data . 5 percentile and then use gen command to create my dummy variables, however I am required to use a more efficient way. For example: gen w=. If the result is true The minimum and maximum values of sbp are 65 and 120, respectively, for category "0" of hisbp. I have data like this . If your data are flongsep, create the new variable in each of the m = 0, m = 1, :::, m = M datasets, and then register the result. Longton > Q4/08 SJ 8(4):557--568 > shows how to answer questions about distinct observations > from first principles; provides a convenience command > > which is downloadable. In this video, we look at how to use the gen Title stata. See[D] format. 5 {gen byte above`n' = Return >= `r(r`i')' local ++i} Kind Regards, Adrian Here's one way to create a dummy for each 5-year interval between 1991 and 2015 (adjust limits to suit your problem) forvalues bot=1991(5)2011 { local top=`bot'+4 gen years_`bot'_`top' = year >= `bot' & year <= `top' /// if !missing(year) } This sets the dummy years_1991_1995 to 1 for years 1991 to 1995, 0 for other valid years and . com/data/r18/genxmpl1 (Wages of women). 写文章. macro values are formatted in base 16 using Stata’s hexadecimal format %21x. This statement can lead to problems. Stack Overflow. I see nothing "worrisome" in that; it's a natural consequence of Stata's division of labour here. The second statement creates xbig equal to 1 or 0, the value being 1 6mean— Estimate means Example 4: profile plots and contrasts Thefirst examplein[R] marginsplot shows how to use margins and marginsplot to get profileplots from a linear regression. In general, it's a loop over the possibilities using forvalues or foreach, but the shortcut is too easy not to be preferred in this case. Imagine that var3 did not exist in the data. gen antidepressant = 0 quietly foreach v in x1 x2 x3 x4 x5 { replace antidepressant = 1 if inlist(`v', 123, 453, 859, 205) } For a review of pertinent technique, see this paper. replace p = 2 in 1 forvalues n = 2 / `=_N' As you want a rank, I suggest the use of -egen, rank()-. com Like replace, dyngen modifies the contents of existing variables. if year > 2002 { bysort year month :egen Z= total( x*weight) } else { bysort year month : egen Z= total(y*weight*0. by id: gen lo_bp = bp[1]. gen d15=1 in -5/-2 Most Stata commands allow the byprefix, which repeats the command for each group of observations for which the values of the variables in varlist are the same. More important, however, is how you can work out the solution to these and similar problems yourself. Most Stata commands allow the byprefix, which repeats the command for each group of observations for which the values of the variables in varlist are the same. (Unfortunatly you're much likely to make mistakes than Stata is) In you specific case, it is probably because your panel is not balanced (i. It takes a while to get used to the minimal style here, namely just ask a technical question and hope for a technical answer. ×Éçô²èK·øzùá‚&4Éàï& Þþˆ 2"T¦‘W‚dTÀž¿Üõ¶·dÕTž@–laã·‹_//þ½ hÂ8a"‘Z ¦’Uuñùk–¬açC’ nt²÷ç*øg É KÊäÓÅÇ) ÁM¢2ArÍŸ"ÁsA83ð h¼ 0D*A½ø@+c Inputting data into Stata [U] 21 Entering and importing data import [D] import edit [D] edit Basic data reporting describe [D] describe codebook [D] codebook list [D] list browse [D] edit count [D] count inspect [D] inspect table [R] table tabulate [R] tabulate oneway and[R] tabulate twoway summarize [R] summarize 1. - Stata command (i. Add a comment | Your Answer Reminder: Title stata. 2 Inputting dates and times Date and time variables are best read as strings. Hi all, I've been reviewing the documentation on Stata to try and figure out how to generate IF NOT statements. generate y = x^2 . 4 %ÐÔÅØ 18 0 obj /Length 1565 /Filter /FlateDecode >> stream xÚ­X[oÛ6 ~ϯÐÛd fÅ«H` °vë° ÃÖ5om ›v„èâIJœüû CR¶ä*‰ƒ A ™—s¿|Go//^¿7¡Œ Éyr¹I ¡F% W„N. But it never hurts to use the more robust coding with parentheses. Dear Nick, Thank you for your clarification of the codes and especially for the last code, as this one worked just fine. Title stata. gen byte mid = . keep if !mod(end,1) Nick On Thu, Sep 1, 2011 at 11:10 AM, Remarks and examples stata. gsort id -bp. Note: This FAQ is for users of Stata 5. gsort— Ascending and descending sort 3 Technical note Assume that we have a dataset containing x for which we wish to obtain the In Stata, in general the above gen command will work because you have variables in your in-memory dataset (similar to a single R dataframe) named var1_a, var1_b, var_2_a, and var2_b. Does any one have a technique (I won't call it a trick) for having I came across a discrepancy between egen total and gegen total when comparing the value of a variable with an observation that is out of bounds (i. e. Quick start Total of continuous variable v1 total v1 Same as above, but restrict estimation to observations where catvar = 1 total v1 if catvar==1 Then, if I want to make a regression with an indicator variable say (for country1 ) it is sufficient to type: reg. dtypes just to get data types. bysort group : gen time = _n will in general produce quite arbitrary values for -time-, just as would . > > See -help xi- or Although you use the term "if statement" all your code is phrased in terms of if qualifiers, which aren't commands or statements. foreach level in ‘r(levels)’ {2. Posts; Latest Activity; Search. bysort rep78 : gen time = _n You're more likely to want something like . B. So I am trying to create binary variables for region continent and for sex from categorical variables/ stream variables. } make str18 price int mpg int rep78 int headroom float trunk int weight int length int turn int displacement int gear_ratio float foreign I have calculated in Stata the percentage observations per group, year, and category in a new variable. com total — Estimate totals DescriptionQuick startMenuSyntax OptionsRemarks and examplesStored resultsMethods and formulas ReferencesAlso see Description total produces estimates of totals, along with standard errors. I tried to find some if statement of Stata to do this like if logincome exists then the following line is skipped. A cookie is a small piece of data our website stores on a site visitor's hard drive and accesses each time you visit so we can improve your access to our site, better understand how you use our site, and serve you content that may be of interest to you. Further in the latest versions of Stata we can combine sort and by into a single statement. Documented at e. If no varlist is specified, summary statistics are calculated for all the variables in the dataset. If no type is specified, the new . gen newvar = cond(spending < 300, X, /// cond(inrange(spending, 300, 500), Y /// cond(spending > 500, Z ))) How would this be rewritten -- supposedly in a simpler and more readable way -- using your preferred functionality? Stata has some utility commands for creating new variables: The egen command is useful for working across groups of variables or within groups of observations. The second statement creates xbig equal to 1 or 0, the value being 1 The Stata functions max() and min() require two or more arguments and operate rowwise (across observations) if given a variable as any one of the arguments. After creating the variable, mi register it as passive; see[MI] mi set. Start by working with a copy of your data:. replace var2 = 'Y' if Practical example Variable nameparmentalVariable labelParental mental illness (Ages 0-14, Years 1970-1984)Value labels0=No1=Yes Variable nameparcrimVariable labelParental criminality (Ages 0-14, Years 1970-1984)Value labels0=No1=Yes gen paradversity=. Improve this answer . by without the sort option requires that the data be sorted by varlist; see[D] sort. gen fyrquarter = ceil(fyrmonth/3) McCain logged 17 minutes in the overtime matchup and finished with a stat line of four points, two rebounds, and one assist. 62e42fefa39efX-001 +1. Select state electorate: Booth breakdown options: Unofficial preliminary count gen fyrdate = year(dofm(mdate - fyr - 1)) . For example, try using _n instead of _n-1 in the formula, and try removing the + 1 at the end of the function. com egen — Extensions to generate DescriptionQuick startMenuSyntax Remarks and examplesAcknowledgmentsReferencesAlso see Description egen creates a new Course: STATA for Complete Beginners 100% Free. If, however, ecolbs has missing and/or Hello I am having a trouble in doing some analysis with stata. Indeed, that is the usual definition of dummies. Stata 数据清洗 & 数据处理. If some parts of your composite variable are numeric sysuse bplong, clear **Notice that gender-patient does not uniquely idenitfy our observations sort sex patient *Flag the row numbers where Stata sorted the "before" observations for each person gen flag_before1 = _n if when == 1 *Do the exact same sort as above sort sex patient *Again flag the row numbers where Stata sorted the "before" observations for each person this time gen The cond() function is the supposedly clunky function alluded to. However it will be assigned a missing value for observations where the if condition is not true. In Stata you can create new variables with generate and you can modify the values of an existing variable with replace and with recode. M. You cannot generate a non-existing variable with -replace-. Counting distinct values: there was a survey of the terrain by Gary Longton and myself in 6mean— Estimate means Example 4: profile plots and contrasts Thefirst examplein[R] marginsplot shows how to use margins and marginsplot to get profileplots from a linear regression. 2[U] 14 Matrix expressions. Another is . I describe how to generate random numbers and discuss some features added in Stata 14. - If we follow the usual technique, Skip to the content following this video. Still, this shows a similar dataset as an example (which came out of editing, some extra code and then dataex) and then some token code. dta in memory append using mydata2 Same as above, and generate newv to Stata codes missing values (. For example, if you have a Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This sounds like ranking to me. keep if !mod(end,1) Nick On Thu, Sep 1, 2011 at 11:10 AM, I know I could get the 0. Stata can also join observations from two datasets into one; see[D] merge. 1 Arithmetic operators The arithmetic operators in Stata are + (addition), - (subtraction), * (multiplication), / (division), ^ (raise to a power), and the prefix - (negation). The immediate answer is that egen does not have a replace option, nor is there a replace-type command corresponding to egen. In particular, Stata 14 includes a new default random-number generator (RNG) called the Mersenne Twister (Matsumoto and Nishimura 1998), a new function that generates random integers, the ability to generate random numbers from an interval, Title stata. webuse nhanes2f gen ageg=2 if age>=20 & age<30 replace ageg=3 if age>=30 & age<40 replace ageg=4 if age>=40 & age<50 replace ageg=5 if age>=50 & age<60 replace ageg=6 if age>=60 & age<70 replace ageg=7 if age>=70 replace Title stata. A simpler and more robust version is something like: gen old=age>25 if !missing(age) Finally note that in nlsw88 dataset (if you are using it) there are no individuals younger than 34. Thus, if we see that indication, we can predict the command in question works with the by: prefix. Computing new variables using generate and replace. . 9. b, etc. Quick start Append mydata2. J. (Your use of the term "statement" is looser than customary, but that doesn't affect an answer directly. If something like day Stata’s if command, in short, is quite different from Stata’s if qualifier. So, we don't need explanations or apologies for being new to anything and we take thanks for granted. Filter. But I don't think you want M to be symmetric anyway Thanks Nick all worked a treat. shape[0] OR len(df). Share. =2) if parmental==1 & parcrim==0 The important thing to keep in mind is that local macros vanish when the do-file within which they were created ends. scatter y x (graph not shown) 1. Note the double equal (==) represents IS EQUAL TO and the pipe ( | Given the following dataset and commands: generate x = . Nick Cox. 1). To achieve the desired result, we must give three commands: capture Stata 中， gen 和 egen 是最常用的变量生成的命令，与之对应，replace 和 ereplace 则是最常用的取值替换的命令是。其中，gen 和 replace 的用法比较简单，ereplace 的多数用法与 egen 相同，这里主要介绍 egen 首发于 1. Commented May 5, 2021 at 8:34 @NickCox thank you very much for the Timothee -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Hebe B. by id: gen hi_bp = bp[1]. All Time Today Last Week Missing is treated as arbitrarily large in Stata, and certainly as greater than 2, which explains why the simpler code . Fiscal year should span 12 months, but there are some observations with missing months Title stata. country1? 2011/4/11 Airey, David C <[email protected]>: > . I tried using if commands, but I would prefer something like the above qualifier if possible because I am more comfortable with it (and it takes less room). 1 means any of them or Home / Resources & support / FAQs / Stata 5: Creating lagged variables. All Time Today Last Week Stata 中， gen 和 egen 是最常用的变量生成的命令，与之对应，replace 和 ereplace 则是最常用的取值替换的命令是。其中，gen 和 replace 的用法比较简单，ereplace 的多数用法与 egen 相同，这里主要介绍 egen 首发于 1. This will create a variable called p to hold prime numbers. I am doing my Mater degree research by using gravity model on Impact of infrastructure investment on Trade, as an empirical investigation for Sri Lanka. gen lag1 = x[_n-1] . gen xs = (x1 + x2 + x3 + x4 + x5 + x6 + x7) >= 2 would bite you if missings were present. If a gen command has an if condition, the resulting variable will (and must) still exist for all observations. If you have missing values in your data, it would be better if you type . However, as soon as you sort or do something with the data set, these _ns will change. However, I will advise again using replace in tostring. 1) Frequency table of numbers of emr vendors used per You are confused with the logic. Also see [D] contract — Make dataset of frequencies and percentages [D] expandcl — Duplicate clustered observations [D] fillin — Rectangularize dataset. gen byte fid = . For each panel, we must identify the first (or perhaps last) occurrence of a state, say, state == 1. Page of 2. Code like those statements will get interpreted as referring to the very first observation in the current sort order, that is, as if you had written if weight[1] < 2500 and so forth. State electorate . sysuse auto . fgzfgz I'm trying to build the following if statement in Stata: I want Stata to restrict my sample with the following conditions keep if distance > 50 & distance < 60 but only if the binary vari Skip to main content. mi copy newname To identify you could: Gen fem45=0 Replace fem45=1 if sex==female & age <=45 Bysort householdid: egen hfem45=max(fem45) That should identify in your household has any female 45 years old or younger On Sun, Apr 10, 2011 at 6:01 PM, Brendan Halpin <[email protected]> wrote: > If you're working with a single wave, something like the following Speaking Stata: Distinct observations > (help distinct if installed) . dta with no data in memory append using mydata1 mydata2 Same as above, but with mydata1. I don't I'd appreciate if somebody could explain the following behavior of the "if" statement when used with "logistic" (I'm running STATA IC/10. We replace fid and mid by each value as appropriate: This article is part of the Stata for Students series. replace var1 = 1 if CONDITION1 & CONDITION2 . count() will accept string variables. About; Products OverflowAI; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; It takes a while to get used to the minimal style here, namely just ask a technical question and hope for a technical answer. In this particular example, at least one further trick is possible. Can egen group() produce actual values instead of 1, 2, 3,. Typing if (age>21) summarize age will summarize all the observations on age if the first observation on age is greater t. If your code is wrong, you have to read in the Forums for Discussing Stata; General; You are not logged in. An expression "double format" can be translated mentally, but using Stata terminology in a Stata question is always the best idea. Overview. com stgen — Generate variables reflecting entire histories DescriptionQuick startMenuSyntax FunctionsRemarks and examplesAlso see Description stgen provides a convenient way to generate new variables reflecting entire histories. , as manual operation often leads to mistakes. Follow answered Jun 3, 2016 at 23:10. _n==0). What am I doing wrong here? If ecolbs is nonnegative and never missing, then you can use assert 0 <= ecolbs & !mi(ecolbs) gen ecobuy = (0 < ecolbs) where the first line simply verifies the assumption (for safety and readability). merge can perform match merges Stata has four different classes of operators: arithmetic, string, relational, and logical. My date variable is a float, format %td (data below). See help on -egen-'s -rank()- function for a more general tool, including options for different ranking conventions. In most other statistical software I know (admittedly, this is not much more than a handful), if clauses are important for creating or changing data. 0g ‘level’ 3. gen dummy=0 replace dummy=1 if substr(dx1,1,4)=="6542" | substr(dx2,1,4)=="6542" sysuse bplong, clear **Notice that gender-patient does not uniquely idenitfy our observations sort sex patient *Flag the row numbers where Stata sorted the "before" observations for each person gen flag_before1 = _n if when == 1 *Do the exact same sort as above sort sex patient *Again flag the row numbers where Stata sorted the "before" observations for each person this time gen by using standard Stata commands, but do that by mi m. Hi. 5 1 2 5 95 98 99 99. No announcement yet. 4,001 1 1 gold badge 16 16 silver badges I have a dataset containing various drugs and the dates they were supplied. Basically I'm trying to extend this question: Stata: I've tried bysort cik year: gen sub_num = _N if loan_amt != 0 and bysort cik year loan_amt: gen sub_num = _N but neither really does it. The egen functions max() and min() can only be used within egen calls. 1. I keep getting back r 109; for a type mismatch with the following code: Stata Python; describe: df. In this article you'll learn how to create new variables and change existing variables. Any suggestions? Answer: The question shows that no matter how many general or special purpose tabulation commands Stata provides, it is always possible to think of a test specifies that Stata test whether rules are ever invoked or that rules overlap; for example, (1/5=1) (3=2). , gen) appears on a new line - Close bracket } appears on another line by itself - Notice that new variables have been created in your dataset. The The word "format" is overloaded in computing, which isn't your fault, but note that in Stata double is a variable or storage type and not a display format. You can use menus and dialogs to create new variables and modify existing variables by selecting menu items from the Data > Create or For this problem, there is a simple Stata solution, which will be revealed in a moment. Once again: Stata supports monthly dates held in a numeric variable with the following rule: January 1960 is, or was, origin 0, and later or earlier months are positive or negative counts test specifies that Stata test whether rules are ever invoked or that rules overlap; for example, (1/5=1) (3=2). for missing years. shape returns a tuple with the length and width of the DataFrame. For more information on Statalist, see the FAQ. 08 Roetersstraat 29 1018 WB Amsterdam The Netherlands tel. Collapse. Remarks and examples stata. If not, then it won't. 62e42fefa39efX+000 > +1. See for the differences Genstat is a powerful data analysis software that delivers insights for confident decisions. Reply random_stata_user • Additional macro values are formatted in base 16 using Stata’s hexadecimal format %21x. It might be a good idea to double check with tab2 age age1 For more help, -help inrange-David At 9:23 AM -0700 8/22/07, Ziad El-Khatib wrote: Dear StataLister, Any tips how to write condition replace to make condition in case of range? Example: variable name is age gen age1 = 0 Remember that Stata commands do either exactly what you say or nothing at all. count if x == ‘level’ 4. ) Code: gen ADDx = (eczema_sum > 2) // 0 or 1 replace ADDx = . But my googling didn't find anything like that. Grouping observations by ID while also creating characteristic variables. keep if mod(end, 1) == 0 or . I am trying to generate an indicator variable (platform=1) that is conditional on a string variable (campus) and if the date is greater than 16 February 2024. display "x =" %10. X. Nick [email protected] webuse nhanes2f, clear gen ageg= floor(age/10) replace sex=0 if sex==2 xi: logistic sex i. Earning a spot in the rotation might be an uphill 1) I would like to generate a new variable : generate newvariable=var1+var2+var3 if dum1=1 and or dum2=1 and or dum3=1 In essence I want to sum across var2, var3 and var4 for a case In Stata there are two. This time type labels with double quotes The minimum and maximum values of sbp are 65 and 120, respectively, for category "0" of hisbp. If your stata matrix M is symmetric, then it will return a symmetric matrix. com merge — Merge datasets DescriptionQuick startMenuSyntax OptionsRemarks and examplesReferencesAlso see Description merge joins corresponding observations from the dataset currently in memory (called the master dataset) with those from filename. In most other statistical software I know (admittedly, this is not much more than a handful), if clauses are important for (See -help missing- Missing values are handled with values like . [U] 25 Working with dates and times3 25. Let us illustrate with the simplest example, computing the number of distinct The question is how to list more than one variable and the answer is to tell Stata which variables you want: list varname_a varname_b if varname_a==1 & varname_b==1 list c d e if varname_a==1 & varname_b==1 That could be all of them: list if varname_a==1 & varname_b==1 list That is all documented under help list. > > -help xi- gives you the noomit option. First, the panel structure is crucial here. -generate- generates a new variable, -replace- changes the contents of an existing variable. If these exist as vectors in your R environment, then our colleague Nick Cox is exactly correct: all is needed is the statement without the leading gen. 5) } The primary method for creating new variables in Stata is the generate command. Otherwise, it will do n. gen seq2 = mod(_n-1,6) + 1 It is valuable to experiment with the mod() function to see what results can be obtained. If you are doing a computation only on a single variable that relies only on its own lagged values or those of other variables, you do not need dyngen because generate and replace work their way through the data Forums for Discussing Stata; General; You are not logged in. Announcement. We could have labeled the categories of hisbp in our recode command. 2obs— Increase the number of The missings are easy to explain: for the first observation in each panel, there is a reference to Dummy[0] which Stata necessarily valuates as missing. > > Stata 11 has factor variables now. I'm a SAS user new to Stata. Stata Python; describe: df. group year category percentage A 2020 1 0. sysuse auto, clear . These functions are intended for use with multiple-record survival data but may be used with single-record data. The variable length contains the length of the car in . There’s no information about seconds. Apart from say years -- which don't need special treatment -- Stata had at first just one kind of date, daily dates, and -date()- was a function to take in string daily dates and emit numeric daily dates. dta in memory append using mydata2 Same as above, and generate newv to Fatma, Steve's solution will work if you really have variables with names of the form x1 x2 x3 x4. I know that I can do this using something like the following but for all 25 dx variables:. 2013. For example, if I want to reset var1 and var2 based on CONDITION1 and CONDITION2, I've so far only been able to use redundant code: . Let’s create a new variable that is the sum of weight and length (ignore for the moment that summing weights and lengths doesn’t make a ton of sense). , are allowed; see prefix". company #001078 in 2007 would have loan_num = 4 and sub_num = 2 . com Remarks are presented under the following headings: Simple examples Setting up value labels with recode Referring to the minimum and maximum in rules Recoding missing values Stata: Identifying unique observations that differ on all variables, by group. To download exercises and course files access:https://bit. gen fyrmonth = month(dofm(mdate - fyr - 1)) . See help functions for the basics, and see the Stata Functions Reference Manual for a complete list and full details of all the built-in functions. If you copy and paste into the Data Editor, say, under Windows by using the clipboard, but data are space-separated, what you regard as separate variables will be combined because the Data Editor expects comma- or tab-separated data. set obs 5 gen var1 = _n label define l_var1 1 "cat1" 2 "cat1" 3 "cat2" 4 "cat3" 5 "cat3" label val var1 Skip to main content Stack Overflow I now realized that if we want STATA to deal with time we have to convert the string variable representing date into "STATA internal form" (count of seconds, days, months or years from 1960) first and then if necessary, change Despite edits, your data example is incomplete and inconsistent in several minor details: diff or different, Housewif or Housewife, Unemployed or unemployed, Business not a defined value label. 69314718 1 x = Orion see <<help extended_fcn>> for the syntax of extended macros. I have not been able to find any references on how to perform multiple operations on data records if a condition is met. N. meric, and a string variable is created if the result is a string. thing. keep if x > 1000 . 6 A 20 Remarks and examples stata. For example (and using a common construct to dispense with explictly naming the macro): . if SP == "0000" replace VALID = 1 if (SP=="2221" | SP=="2231" | SP=="2211" | SP=="2311" | We can use if with most Stata commands. It has the signal advantages that you can make the inequalities explicit in your code and exactly as you wish, neither of which is true of egen, cut(). 193ea7aad030bX+000 +1. Stata Journal readers can find a self-contained tutorial on by (Cox 2002). dtype: count: df. – Nick Cox. To Stata, a matrix is a named entity containing an r c (0 < r matsize, 0 < c matsize) rectangular array of double-precision numbers (including missing values) that is bordered by a row and a column of names. Nick Cox Nick Cox. clear sysuse auto describe Results-auto. in Stata. For instance, you may wish to create types of household. * * For searches and help try: * PS - what do you want to do if x==5? C. You're hoping or imagining that the prefix by: implies comparisons within a group, but at best one way: gen newvar=y replace newvar=y+1 if x>5 & x<. an 21. If anything didn't make sense it's better to have the original to check against. generate age2=age^2 variable age2 already defined r(110); When we attempt to re-generate age2, ifier. Period 1 is 1 April to 30 June, and period 2 is 1 October to 31 December. cab0bfa2a2002X+000. The following command What syntax do I use in Stata to generate a variable that requires multiple conditions? Here is what I'm trying to use and it's not working: Only then do I want a 1 for the a new variable. Example 2 - Suppose we want to create a number of interaction variables by multiplying the polity variable with a number of selected variables (pcgdp, eduexp, govtexp). If I use egen with if,. com if — if programming command DescriptionSyntaxRemarks and examplesReferenceAlso see Description The if command (not to be confused with the if qualifier; see [U] 11. Quick start Total of continuous variable v1 total v1 Same as above, but restrict estimation to observations where catvar = 1 total v1 if catvar==1 Overview. We might think that our command would be guaranteed to eliminate var1, var2, and var3 from the data if they exist. pgvet yvs yvlk spypz dywuy frujp dskq dazlt sanzp jzojh