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AW: st: a specific data management question


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: a specific data management question
Date   Wed, 11 Aug 2010 09:13:24 +0200

<> 

I think this code comes closer to Grace`s wishes, as the maximum was not
really requested, but a count:

*************
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 = total(tag==1), by(firm)

l, sepby(firm) noo
*************


As always, http://www.stata-journal.com/sjpdf.html?articlenum=pr0004 is the
best source...


HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Michael N.
Mitchell
Gesendet: Mittwoch, 11. August 2010 06:27
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: a specific data management question

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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