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Re: st: eliminate oppositie positive and negative values


From   Ronán Conroy <rconroy@rcsi.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: eliminate oppositie positive and negative values
Date   Thu, 29 Mar 2007 10:11:36 +0100

On 29 Márta 2007, at 02:41, sara borelli wrote:

I need to drop the negatives and the positives with
the same date abs(charge) abs(xm) proc personid. As
suggested by Michael Blasnik in a previous e-mail I
runned the following:
doesn't that mean that the charges for a given date should sum to zero?

If that's the case then can't you just sum the charges within each person within each date and check if they are zero?

=========
Ronán Conroy
Royal College of Surgeons in Ireland
rconroy@rcsi.ie
+353 (0) 1 402 2431
+353 (0) 87 799 97 95
http://www.flickr.com/photos/ronanconroy




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