For example, we define a local macro called "country" with the list of countries phl, sgp, and tha: local country phl sgp tha foreach c of local country{use data`c'.dta, clear ..} Archived. Ask Question Asked 5 years, 5 months ago. generate str8 varb = "missing" . generate str8 varc = "c" . foreach var of varlist VARIABLES { //VARIABLES = the varlist of your responses gen r_`var' = `var'==a_`var' replace r_`var' = . foreach v1 of varlist `mylist1' { 2. label var The command regress returns factor if `i' == month is implemented by testing every observation to see whether it should be included in the regression. But both these take almost exactly the same amount of time as the -while- looping command. The loop above repeats the 2 -gen- commands for each of the variables in varlist. Stata commands in recoding variables Without using foreach command foreach command with in option foreach command with of varlist option replace var1 = . You want 11 corresponding new variables, each of which is to be an indicator 1 if the corresponding existing variable is 2 or 3, 0 if it is 1, and missing otherwise. In this post, I show a few of simple example "loops" using Stata commands -foreach-, -local- and -forvalues- to handle some common simple repetitive tasks. A guide to using Stata for data work. Hello fellow Stata . 1. That is, if you are going to loop over a wildcard varlist, you can loop directly with foreach and said varlist. Personally, I still tend to reach for -renvars- (SJ) because I internalised most of the syntax over ten years of using it. gen vars = "" local i = 1 foreach v in `indepvars' { di . First, locals are called starting with the "`" (key to the left of 1 on US keyboards) and ends with "'" (key to the left of enter on US keyboards). When the names are in common, the variables are numbered sequentially, but they are not stored sequentially. 2. Date. (322);". Note that this assumes that the variables in question really are string, as you report. NB: it's just one loop. To export the regression output in Stata , we use the outreg2 command with the given syntax: outreg2 using results, word. It works fine if your variables have numerical suffixes, as in your example and John's solution. Here is one way to do it. However, you need a thorough understanding of local macros, and the best way to achieve that is to read the Stata User's Guide. (At least that it is what I recall.) 1. In Stata 12, -rename- is now so versatile that writing your own -foreach- loop shouldn't be necessary for renaming. varname1 as an unambiguous abbreviation of a variable name whenever it is, indeed, an unambiguous abbreviation. 3. 1 Answer. If var2 ==99 replace `var' =. Suppose you want to rename the variables price and mpg to price_78 and mpg_78 respectively. Producing Multiple Graphs at Once Updated: Aug 27, 2020 You can use the forvalues {} or foreach {} loops in Stata to create a set of graphs all at once. generate str8 vara = "a" . For instance, pretend that the order of the variables in the dataset is 1. v1 2. alpha 3. v3 4. beta 5. v4 6. v2 7. gamma Then typing . In the example below we use the foreach command to cycle through the variables inc1 to inc12 and compute the taxable income as taxinc1 - taxinc12. If so, this is a code sketch. Stata Commands in Recoding Variables Table 4. local newvars teacher_late teacher_absent teacher_skip teacher_bully teacher_harass_teachers . sysuse auto, clear. local depvar binvar1 local indepvars predvar1 predvar2 predvar3 * expand and check collinearity * _rmdcoll `depvar' `indepvars', expand local indepvars "`r (varlist)'" * first order individual variables by best chi-squared * gen chisq = . The foreach syntax for a varlist is different and starts with foreach x of varlist instead of foreach x in. Method 1 This three-step process always works. Thu, 28 Mar 2013 13:42:19 -0700. . if `var'>=99 } In the above code, I assume that you have consistency in naming of variables. foreach v1 of varlist `mylist1' { 2. replace `v1'="na" if `v1' =="missing" 3. } Sorted by: 2. Load the example dataset auto.dta using the sysuse command:. Yes, see -help varlist- There isn't much to loops in Stata; all I can think of are -while-, -foreach- and -forvalues-. Here we use the -generate- command to create a new variable representing population younger than 18 years old. regress price mpg headroom trunk gear_ratio displacement. . foreach lname of varlist list {:::} gives list the interpretation of a varlist. Example data. Count unique values in Stata . You can do this with the set graphics off command. Further, checks for equality are entirely literal: all characters must match in turn. The other variants of -foreach- are: List defined in macros (local or global). For example: gen asean4 = 1 if inlist (countrycode, 360, 458, 608, 764) The difference between using numeric and string values is in the number of allowable elements in the list (number of countries in our example). using results indicates to Stata that . These commands may be used interactively, and none is restricted to use in Stata programs. We use variables of the census.dta data come with Stata as examples.-generate-: create variables . su group, meanonly Among other things, this second step leaves behind in r (max) the number of distinct values; see [R] summarize for details on saved results. is different in principle as the syntax will first check whether that is indeed a varlist before the loop is even entered. Fatma, Steve's solution will work if you really have variables with names of the form x1 x2 x3 x4. We do so by summing up the two existing variables >: poplt5 (population < 5 years old) and pop5_17 (population of 5 to 17 years old). Two commands in official Stata, foreach and forvalues, provide structures for looping through lists of values (variable names, numbers, arbitrary text) and repeating commands using members of those lists in turn. If you are generating and saving a large number of graphs in this way, I suggest turning graphics off while it is running. The way -if- is implemented. foreach x of varlist mpg weight-turn {:::} has four elements, mpg, weight, length, and turn, because list was given the interpretation of a varlist. The list is expanded according to standard variable abbreviation rules, and the existence of the variables is conrmed. Obtain strings from and put strings into Stata macros: st_macroexpand() Expand Stata macros in string : st_matrix . -foreach-: loop over items Consider this sample dataset of monthly average temperature for three years. However, if your variables do not have numeric suffixes, you have to resort to some tricks. RE: st: foreach command with multiple varlists. 006 Stataforeach. You could of course type the rename command as many times as you need (in this case it would be twice), but you can automate . You don't need ds to push the varlist into r (varlist). For numeric values, 254 elements are allowed and for string values, only 9. You have 11 existing variables. as compared to -forval- or -by:- when the approaches are comparable). In Stata, I can do. The interpretative overhead of -while- (e.g. EDIT NJC: foreach v of var var* { display "`: subinstr local v "var" "", all'" } would seem to be the same nice idea simplified. . User account menu. This works because R automatically fills up any column ("vector") to the length of the dataframe (called "recycling"). 1. foreach i of varlist ht wgt bmi { gen `i'mean = mean (`i') } The solution, using lapply simple calculates the mean and puts it into a new variable/column. Computing variables (using the foreach command) Another way to compute 12 variables representing the amount of tax paid (10%) for each month is to use the foreach command. 1. Counting unique values . About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . The only thing Stata is missing is an easy way to specify variables v1, v2, .. gen schoolage = 0 foreach v of var hh_*_age { replace schoolage = schoolage + inlist(`v', "6 - 10 years of age", "11 - 14 years of age") } would be one solution to that. (0 real changes made) (1 real change made) (0 real changes made) . That is, if your response variable is named "question1", then your correct answer variable is named "a_question1". Close. Counting unique values . The syntax for a foreach loop over a varlist is as follows: foreach macro of varlist vars {Note that while the foreach syntax for a generic list contains in, the syntax for a structured list has of. This, IMO, is a weakness of Stata compared to SAS (for example): the inability to create an array from a list of variables and index the array numerically. set obs 1 obs was 0, now 1 . list v1-v4 inlist may also be used for numeric values. That's because in the first specification above, not_smsa is . Stata . Now for your code, you have three problems. if `var' foreach is used to loop through essentially a list of words. 2. Posted by 3 years ago. Thanks Nick, I tried the -statsby- command as Scott Merryman suggested and the -forval- command that you are suggesting. local mylist1 vara-varc . you can also do it the way you described, but you have to copy the return value of describe, varlist into a local (named 'vars' in syntax below), and then use that local in the foreach-loop Code: quietly describe _begin - _end, varlist local vars = r (varlist) foreach x of varlist `vars' { display " `x' " } Greetings, Klaudia Klaudia Erhardt egen group = group (varname) This first step maps the distinct values of varname to 1, 2, 3, and up to the number of distinct values. 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 . If var1 ==99 foreach var in var1 var2 var3 var4 var5 {foreach var of varlist var1-var5 {replace var2 = . It's not even necessarily the same in practice as -- unless you have set varabbrev off -- foreach will accept e.g. The manual entry for each (no pun intended) of these commands is helpful. Stata uses the in or of to determine whether the next word is the first element of the list or a type of list. { foreach lname of varlist varlist { foreach lname of newlist newvarlist { foreach lname of numlist numlist { Braces must be specified with foreach, and 1. the open brace must appear on the same line as the foreach; 2. nothing may follow the open brace except, of course, comments; the . 4by Repeat Stata command on subsets of the data Also see [D] sort Sort data[D] statsby Collect statistics for a command across a by list[P] byable Make programs byable[P] foreach Loop over items[P] forvalues Loop over consecutive values[P] while Looping[U] 11.1.2 by varlist:[U] 11.1.10 Prex commands[U] 11.4 varname and varlists[U] 11.5 by varlist: construct
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