About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Ask Question Asked 5 years, 5 months ago. But both these take almost exactly the same amount of time as the -while- looping command. Archived. When the names are in common, the variables are numbered sequentially, but they are not stored sequentially. { 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 . Counting unique values . Further, checks for equality are entirely literal: all characters must match in turn. generate str8 varb = "missing" . We use variables of the census.dta data come with Stata as examples.-generate-: create variables . Close. Personally, I still tend to reach for -renvars- (SJ) because I internalised most of the syntax over ten years of using it. regress price mpg headroom trunk gear_ratio displacement. 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. foreach v1 of varlist `mylist1' { 2. replace `v1'="na" if `v1' =="missing" 3. } You have 11 existing variables. varname1 as an unambiguous abbreviation of a variable name whenever it is, indeed, an unambiguous abbreviation. The manual entry for each (no pun intended) of these commands is helpful. Method 1 This three-step process always works. Posted by 3 years ago. 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 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 ..} 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. Example data. 2. gen vars = "" local i = 1 foreach v in `indepvars' { di . Sorted by: 2. foreach v1 of varlist `mylist1' { 2. label var In Stata, I can do. Stata uses the in or of to determine whether the next word is the first element of the list or a type of list. In Stata 12, -rename- is now so versatile that writing your own -foreach- loop shouldn't be necessary for renaming. If var2 ==99 replace `var' =. However, if your variables do not have numeric suffixes, you have to resort to some tricks. That is, if you are going to loop over a wildcard varlist, you can loop directly with foreach and said varlist. foreach is used to loop through essentially a list of words. 1. That's because in the first specification above, not_smsa is . These commands may be used interactively, and none is restricted to use in Stata programs. Hello fellow Stata . Thu, 28 Mar 2013 13:42:19 -0700. generate str8 varc = "c" . . 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. 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. list v1-v4 1. . Counting unique values . 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. Obtain strings from and put strings into Stata macros: st_macroexpand() Expand Stata macros in string : st_matrix . 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). The loop above repeats the 2 -gen- commands for each of the variables in varlist. User account menu. local mylist1 vara-varc . inlist may also be used for numeric values. Stata Commands in Recoding Variables Table 4. The foreach syntax for a varlist is different and starts with foreach x of varlist instead of foreach x in. 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. 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. The only thing Stata is missing is an easy way to specify variables v1, v2, .. Fatma, Steve's solution will work if you really have variables with names of the form x1 x2 x3 x4. (322);". 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 interpretative overhead of -while- (e.g. If so, this is a code sketch. set obs 1 obs was 0, now 1 . Stata commands in recoding variables Without using foreach command foreach command with in option foreach command with of varlist option replace var1 = . -foreach-: loop over items Consider this sample dataset of monthly average temperature for three years. Load the example dataset auto.dta using the sysuse command:. if `var'>=99 } In the above code, I assume that you have consistency in naming of variables. If var1 ==99 foreach var in var1 var2 var3 var4 var5 {foreach var of varlist var1-var5 {replace var2 = . Thanks Nick, I tried the -statsby- command as Scott Merryman suggested and the -forval- command that you are suggesting. is different in principle as the syntax will first check whether that is indeed a varlist before the loop is even entered. foreach var of varlist VARIABLES { //VARIABLES = the varlist of your responses gen r_`var' = `var'==a_`var' replace r_`var' = . 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 . as compared to -forval- or -by:- when the approaches are comparable). 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. For numeric values, 254 elements are allowed and for string values, only 9. It's not even necessarily the same in practice as -- unless you have set varabbrev off -- foreach will accept e.g. The command regress returns factor if `i' == month is implemented by testing every observation to see whether it should be included in the regression. The way -if- is implemented. You can do this with the set graphics off command. 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 . Now for your code, you have three problems. However, you need a thorough understanding of local macros, and the best way to achieve that is to read the Stata User's Guide. . sysuse auto, clear. Note that this assumes that the variables in question really are string, as you report. 006 Stataforeach. 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. This works because R automatically fills up any column ("vector") to the length of the dataframe (called "recycling"). That is, if your response variable is named "question1", then your correct answer variable is named "a_question1". 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 foreach lname of varlist list {:::} gives list the interpretation of a varlist. Suppose you want to rename the variables price and mpg to price_78 and mpg_78 respectively. EDIT NJC: foreach v of var var* { display "`: subinstr local v "var" "", all'" } would seem to be the same nice idea simplified. To export the regression output in Stata , we use the outreg2 command with the given syntax: outreg2 using results, word. Stata . 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 . (At least that it is what I recall.) 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. (0 real changes made) (1 real change made) (0 real changes made) . If you are generating and saving a large number of graphs in this way, I suggest turning graphics off while it is running. A guide to using Stata for data work. Date. Here is one way to do it. The other variants of -foreach- are: List defined in macros (local or global). 1 Answer. 2. Count unique values in Stata . NB: it's just one loop. 1. using results indicates to Stata that . Yes, see -help varlist- There isn't much to loops in Stata; all I can think of are -while-, -foreach- and -forvalues-. 1. 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. RE: st: foreach command with multiple varlists. 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). Here we use the -generate- command to create a new variable representing population younger than 18 years old. 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. 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. local newvars teacher_late teacher_absent teacher_skip teacher_bully teacher_harass_teachers . 3. You don't need ds to push the varlist into r (varlist). It works fine if your variables have numerical suffixes, as in your example and John's solution. generate str8 vara = "a" . if `var' 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).