Stata foreach loop

Question

I am trying to execute a Stata foreach loop, but I keep encountering an error that the variable does not exist even though when I look in my data editor it does exist, and I am capable of looking at it using list some_column. This is what I am doing:

foreach x of varlist some_column1 some_column2{
            list x
 }

Could someone help me identify the problem?

Roberto Ferrer · Accepted Answer · 2014-05-27 20:19:13Z

3

You're asking Stata to list the variable x, which clearly you don't have. What you really want is to list the contents of the local macro x. To do that, enclose it within appropriate quote marks.

clear all
set more off

sysuse auto

foreach x of varlist weight mpg {
    list `x' in 1/10
}

See the manual: [P] macro. help foreach is filled with examples.

edited May 27, 2014 at 20:19

answered May 27, 2014 at 19:58

Roberto Ferrer

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1 Comment

Nick Cox Over a year ago

Perhaps list here is just providing an example. If your interest really is in listing two or more variables, don't use a loop, as list will provide a simultaneous listing of several variables.

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