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Re: st: repeated measures


From   Michael McCulloch <mm@pinestreetfoundation.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: repeated measures
Date   Tue, 7 Sep 2010 13:07:41 -0700

Michael,
This is possible with the -reshape- command. What you are starting with is the "long" data format, and you can use that command to change to "wide." However, there appear to be a few problems with your description: 1. Did you mean patient ID=4, not =3, in the last line of the data format you're seeking? 2. In the desired data format you list the "glu" data point for subject ID=3 as being from a different date than the original 6/1/09.
Michael

On Sep 7, 2010, at 12:54 PM, Michael Eisenberg wrote:

Colleagues,

I have a problem I hope you can help with that involves cleaning a
dataset for analysis.

I have a dataset with about 10K men.  Several men had multiple clinic
visits, so that there are about 12K observations.  There is also some
lab data that I'll need that was not obtained until follow up visits.

I would like to only analyze data from the earliest visit and the
first available lab data.

Can stata do this?


Turn this

patient     visitdate    sbp       dm          glu
1              1/1/09       140       .             .
1              1/4/09       128       .            202
1              2/1/09       131      1            .

2              4/1/09       160      .             341
2              4/4/09       144       .            180
2              5/1/09       170      1            .

3              6/1/09       119       .             .
3              6/4/09       107       .            .
3              7/1/09       124      .            96

4              9/1/09       104       1          110
4              9/4/09       155       .            .
4             10/1/09       .         .              .

Into this

patient     visitdate    sbp       dm          glu
1              1/1/09       140      1             202
2              4/1/09       160      1            341
3              6/1/09       119       .            96
3              9/1/09       104      1            110




Thanks in advance.

Mike
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Best wishes,

Michael McCulloch, LAc MPH PhD
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel:	415-407-1357
fax: 	206-338-2391

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