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st: total() returns zero if all missing in long-format data


From   Shehzad Ali <drshehzad_ali@yahoo.com>
To   Stata List <statalist@hsphsun2.harvard.edu>
Subject   st: total() returns zero if all missing in long-format data
Date   Mon, 29 Oct 2012 13:19:52 +0000 (GMT)

Hi listers,

In long-format data structure (multiple obs per id), the total() function returns zero if all values of the variable for a particular id are missing. Can anyone suggest the best way to ensure that the total returns missing when all values are missing for a particular id?

bysort id: egen total = total(var1)

Many thanks
Shehzad

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