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st: RE: Combining multiple observations by an ID variable

From   "Swanquist, Quinn Thomas" <>
To   "" <>
Subject   st: RE: Combining multiple observations by an ID variable
Date   Tue, 12 Jun 2012 21:16:11 +0000

Do you have an identifier for visit number (if not you could use date).

Sort as follows:

sort IDcode visit

then merge many to one as follows:

merge m:1 IDcode using "usingfile"

Quinn Swanquist

-----Original Message-----
From: [] On Behalf Of Claude Beaty
Sent: Tuesday, June 12, 2012 5:02 PM
Subject: st: Combining multiple observations by an ID variable


I have a large dataset of observations in which individuals (~40,000 ID codes) were evaluated multiple times (5-10 visit numbers per individual) on over 70 variables. However, the data has been arranged so that each visit number is an observation, instead of each individual ID code as an observation. I need to merge this file with another file sorted by individual ID codes. How do I rearrange this data so that it is arranged by ID codes with consecutive follow up visits? Thanks

Claude A. Beaty Jr., M.D.
Halsted Surgical Resident
Cardiac Surgery Research Fellow
The Johns Hopkins Hospital

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