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st: merge/joinby/append

From   Federico Castillo <>
Subject   st: merge/joinby/append
Date   Tue, 02 Mar 2004 07:26:23 -0800

Hello Stata users:

I am trying to "merge" three data sets.  It is my understanding that merge
joins observations, append adds a data set to the end of the existing data
set and joinby forsm pairwise variables etc.  I do have a problem and that
is that while most of the observations in the three data sets are common to
all three there are a few that are not, hence, when I attempt to use append
(to add new variables to existing observations) some of the observations
are ignored in the resulting data set.  Is there a way to avoid this?
Should I pay special attetion to some particular detail? of
observations not being exactly teh same in all data sets? Acess to manuals
at this point is not possible since I am out of the country now.

Thanks in advance,


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