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st: Dropping all subjects but those in the last period
From
"Miguel Angel Duran" <[email protected]>
To
<[email protected]>
Subject
st: Dropping all subjects but those in the last period
Date
Mon, 8 Apr 2013 21:26:46 +0200
My dataset includes observations for about 9000 companies per year in a
twenty years period. To clean the dataset, I would like to drop all those
companies that are not present in the last year (because the rest went
bankrupt or were absorbed), but I do not know how to do it. Can this be done
just by splitting the datasets by period and then merging them? Each
company has the same id across years. Thanks.
Miguel A. Duran.
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