check if variable is present and append to local varlist

[Max Schwartz]

Hi,

I want to loop over all values of a local varlist and check if a variable of that name is present in the dataset. If it is I want to add it to a second varlist that I can use for my next step. To rephrase: I have a predefined list of possible variable names of which some but not all are present in the dataset and I want to identify only those that are present.

local vlist0 foo bar dar

local vlist1
foreach item of local vlist0 {
capture confirm variable `item'
if _rc==0
local vlist1 `vlist1' `item'
display "`vlist1'"
}

[Max Schwartz]

Excuse my question I have added the brackets and now it works

local vlist0 foo bar dar

local vlist1
foreach item of local vlist0 {
capture confirm variable `item'
if _rc==0{
local vlist1 `vlist1' `item'
display "`vlist1'"
}
}