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st: use dummy variable for nonmissing data


From   "Rainald Borck" <Rainald.Borck@uni-passau.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: use dummy variable for nonmissing data
Date   Fri, 14 Jan 2011 16:33:17 +0100

Hello,
 
I have survey data for individuals from several countries and years like this

id country year var1 var2
1 A 1900 1 2
...
200 B 1900 3 .
...


 
I have created country_year dummies using
xi i.country*i.year, noomit
 
Now I want to tell Stata to temporarily drop (or not use) the variable _IcouXyea_country_year if that country does not have observations for that year (i.e. the variable is missing for all individuals from that country and particular year). Can anyone help?
 
Thanks
Rainald
 

----------------------------
Rainald Borck
University of Passau
94030 Passau, Germany
Tel. +49-851-509-2540
http://www.wiwi.uni-passau.de/borck.html
----------------------------



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