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st: using the "or" in 'keep if' command


From   "Nisha Malhotra" <malhotra@econ.bsos.umd.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: using the "or" in 'keep if' command
Date   Fri, 14 Jun 2002 22:08:02 -0400

Hi,
Hope someone can help me with this
I have a dataset of households in various zip codes.  I want to keep only those hholds that are in 700 particular zip codes that I've identified. The logical way to do this in stata is to write a command that looks like this:

keep if zip=="12345" | zip=="12456" | zip=="00234" | zip==..............

There would be about 700 "or" conditions.

The problem is, Stata doesn't allow this many "OR" conditions in that statement.  This command works fine if I only put in 10 or 20 zips.  It gives me an error saying "too many literals" if I put in all 700 zips in my list.

Is there any other way for me to perform this operation?

This is doable in SAS, since there's a command:

if in (insert list of zip codes here);  

Perhaps there's an analogous command in Stata?

Thanks in advance for your help.


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