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st: Drop observations

From   "Vidya Mahambare" <>
To   <>
Subject   st: Drop observations
Date   Mon, 10 Nov 2003 16:41:18 +0000

For panel data regression, I want to include only those firms which have
observations for at least for four consecutive years out of ten. I suppose I
have to use drop or keep command, but can't figure out how.


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