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st: Re: eliminate negative values and their positive counterpart


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: eliminate negative values and their positive counterpart
Date   Tue, 06 Mar 2007 14:15:45 -0500

I'm not sure if you require that the charges exactly offset each other or not, but if they do, then this should work:

gen abscharge=abs(charge)
bysort personid proc date abscharge (charge) : gen hasnegative=charge[1]<0
bysort personid proc date abscharge : gen sumcharge=total(charge)
drop if hasnegative & sumcharge==0
drop hasnegative sumcharge

You may want to browse at the dataset prior to issuing the drop command to see if it does what you want.

Michael Blasnik

----- Original Message ----- From: "sara borelli" <saraborelli77@yahoo.it>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, March 06, 2007 1:48 PM
Subject: st: eliminate negative values and their positive counterpart



dear satalist members,

This is an exctract of my data:

<snip>
where the dots indicate that other values for the same
personid are in between. I need to eliminate the
negative charges AND their positive counterpart with
the same proc and date. Thus, for example I need to
eliminate the negative
-13 80048    6/7/2001
AND its positive counterpart with the same proc and
date:
+13   80048    6/7/2001,
and so on.
I should find a way to construct an algorithm that
identifies and eliminates the negatives AND their
poistive counterpart with he same date and procedure,
but I cannot figure that out.
Any help would be really appreciated

thanks
Sara Borelli
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