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st: Data management - database question


From   "Elmar Saathoff (compuserve.de)" <elmarsaathoff@compuserve.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Data management - database question
Date   Fri, 27 Aug 2004 14:25:09 +0300

Dear Listers,
Any help with the below problem would be very much appreciated:

I have a wide dataset with the following variables:
ID, Specimen1, Spec2......Spec11, StartDate, EndDate

ID contains an identifier as you might already have guessed
Spec1 to Spec11 contain collection dates (in ascending order) for the
first, 2nd, 3rd etc. specimen. Spec1 has a complete set of
observations, Spec2 is only non-missing if there was more than one
Spec for that person etc. Spec Dates for the same specimen rank vary
between different observations.




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