
From  "Michael Blasnik" <michael.blasnik@verizon.net> 
To  <statalist@hsphsun2.harvard.edu> 
Subject  Re: st: eliminate oppositie positive and negative values 
Date  Thu, 29 Mar 2007 08:32:41 0400 
On 29 Márta 2007, at 02:41, sara borelli wrote:doesn't that mean that the charges for a given date should sum to zero?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 email I runned the following:
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?
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