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Re: st: a specific data management question


From   "Michael N. Mitchell" <Michael.Norman.Mitchell@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: a specific data management question
Date   Tue, 10 Aug 2010 21:27:22 -0700

How about this...

clear
input firm   tag
       1     0
       1     0
       1     1
       1     1
       1     3
       2     0
       2     1
       2     2
       2     3
       3     0
       3     0
end
egen tag1 = max(tag==1), by(firm)

However, note that this gives a value of 0 if all values of tag are . for a given firm.

Hope this helps,

Michael N. Mitchell
Data Management Using Stata      - http://www.stata.com/bookstore/dmus.html
A Visual Guide to Stata Graphics - http://www.stata.com/bookstore/vgsg.html
Stata tidbit of the week         - http://www.MichaelNormanMitchell.com



On 2010-08-10 8.50 PM, Grace Jessie wrote:
    firm   tag
        1     0
        1     0
        1     1
        1     1
        1     3
        2     0
        2     1
        2     2
        2     3
        3     0
        3     0
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