I'm collapsing the standard deviation for a set of variables (monthly
frequency):
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
[email protected]
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