Xiangping wrote among other things:
replace areax1=areax1+var`i' if var`j'=xvar1
-----------------------
The rightmost equal-sign is relational, so it should be ==
replace areax1=areax1+var`i' if var`j'==xvar1
Svend
________________________________________________________
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000 Aarhus C, Denmark
Phone, work: +45 8942 6090
Phone, home: +45 8693 7796
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