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st: How to drop observations in panel
From
Islam Abdeljawad <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: How to drop observations in panel
Date
Fri, 5 Aug 2011 22:36:22 -0700 (PDT)
Hi, there
I am new to stata. I am working on an unbalanced data set where firm is the cross section identifier
and the time identifier is year.
Estimation of the model will be based
on GMM-sys. some of my firms have only one or two years of observations.
Should I drop these firms and how I can do it in stata. in other words, any firm
that have less than three years of data
available (less than three observations) will not be included in the estimation.
In the moment i can't figure it out by myself.
Hopefully someone can help me.
Islam Jawad
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