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st: Counting number of observations in the following 4 years


From   micdepo mic <micdepo@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Counting number of observations in the following 4 years
Date   Thu, 20 Feb 2014 00:24:46 +0000

Hi,

I have data on variable X for a period of time. I am trying to count
for every given year t the number of future observations on X in the
following 4 years. I will keep this year's observation X_t iff I know
for sure X_t+k is not missing for k=1,2,3,4 (i.e. I have data on X for
every year in the next four years). This will go on for every year t
from t=1 to T. I would be most grateful if you could please tell me
the easiest way to do this kind of operation. Thanks very much in
advance.

Best regards,
Mic
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