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st: Combining two data files and follow-up data in Stata


From   Ashwin Ananthakrishnan <ashwinna@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Combining two data files and follow-up data in Stata
Date   Fri, 30 Jun 2006 04:48:17 -0700 (PDT)

Hi,

I currently have 2 data files in Stata - the first
file is the main file with a list of all the subjects
in the study organised by a main_ID number. I have a
second file which contains follow-up data - with each
entry representing one follow-up visit. That file is
sorted by the main_ID also but because each patient
has more than 1 follow-up visit, there might be
multiple entries per main_ID. 

1. How do I combine these two data files using main_ID
as the common variable?

2. How can I combine the follow-up data such that I
have one 1 record for each main_ID number which lists
the outcome at each follow-up visit?

Thanks,
Ashwin

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