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st: merging data unique identification problem


From   Jennifer Delaney <delaneyj@stanford.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: merging data unique identification problem
Date   Tue, 31 Jan 2006 13:07:51 -0800

I have two datasets that I am trying to merge.  One dataset (A) is uniquely
identified by three variables (ID YEAR SEMESTER).  The other dataset is
uniquely identified by four variables (ID YEAR SEMESTER GRANTTPYE).  In the
second dataset (B) students can get more than one GRANTTYPE in a given
semester so it is important to keep this factor.

What I've been trying to do is to collapse the second dataset (B) so that it
is identified by only three variables then I can merge it with dataset A.

I think it's clearest if I can illustrate with a simple example...

Current form of dataset B:

ID  YEAR  SEMESTER  GRANTTYPE AWARDAMT
1   1990   Fall         1        500
1   1990   Fall         0        200


Form that I am attempting to convert dataset B into:

ID  YEAR  SEMESTER  GRANTTYPE1awardamt  GRANTTYPE2awardamt
1   1990   Fall          500                200


The only form that I have been able to achieve so far:
ID  YEAR  SEMESTER  GRANTTYPE1awardamt  GRANTTYPE2awardamt
1   1990   Fall          500                .
1   1990   Fall          .                  200


How do I "squish" the data so that I end up with one entry per kid per year
per term?

Thanks,

Jennifer

-- 
Jennifer Delaney
PhD candidate in Higher Education
Stanford University
delaneyj@stanford.edu
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