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Re: st: RE: finding duplicates in two groups


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: finding duplicates in two groups
Date   Fri, 15 Aug 2008 08:45:46 -0400

-cross- will give you all pairs of observations from two data sets.

-Steve
On Aug 15, 2008, at 8:27 AM, Martin Weiss wrote:

Not sure what "for each.." is supposed to mean. If you want agreement in
terms of the values of one of them,

*********
clear*
set obs 10000
g a =runiform()<0.7
g b =runiform()<0.7
g dummy=a==b
*see examples
l in 1/100
*********

If you want to turn one variable into two along the lines of group
membership, - separate- might be handy...

HTH
Martin

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael McCulloch
Sent: Friday, August 15, 2008 5:58 AM
To: Statalist
Subject: st: finding duplicates in two groups

Dear Statalist members,
I have a dataset containing survival data, in which exposure groups
are A and B.

I wish to find records in group A that share the same values in group
B, for each of several fields:
age
date of diagnosis
date of death

I have studied the commands dups and duplicates but don't see how
they can handle finding values from two different groups sharing the
same values. I'd appreciate any suggestions or pointers.

--

Best wishes,
Michael McCulloch



Pine Street Foundation
124 Pine St., San Anselmo, CA 94960-2674
Tel: (415) 407-1357
Fax: (415) 485-1065
mcculloch@pinestreetfoundation.org
www.pinestreetfoundation.org

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