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st: use dummy variable for nonmissing data

From   "Rainald Borck" <[email protected]>
To   <[email protected]>
Subject   st: use dummy variable for nonmissing data
Date   Fri, 14 Jan 2011 16:33:17 +0100

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.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?

Rainald Borck
University of Passau
94030 Passau, Germany
Tel. +49-851-509-2540

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