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st: collapse

From   "Riano, Alejandro" <>
Subject   st: collapse
Date   Tue, 10 Sep 2002 17:48:49 -0400

I'm collapsing the standard deviation for a set of variables (monthly

collapse (sd) er rer, by(country_name year)

but if for example one country doesn't have data for all the year, i'm
getting a 0 instead of a missing value after doing the collapse, do you know
how can i solve this ?

Alejandro Riano
Research Department
Inter-American Development Bank
(202) 623-1932

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