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Re: st: Re: eliminate negative values and their positive counterpart


From   sara borelli <saraborelli77@yahoo.it>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: eliminate negative values and their positive counterpart
Date   Thu, 8 Mar 2007 15:22:50 +0100 (CET)

thank you so much for your help!

sara
--- Michael Blasnik <michael.blasnik@verizon.net> ha
scritto:

> Here's one way to only drop matched pos/neg pairs:
> 
> gen abscharge=abs(charge)
> bysort personid proc date abscharge (charge) : gen
> byte 
> todrop=charge!=charge[_n-1] & _n>1
> bysort personid proc date abscharge (charge) :
> replace todrop=1 if 
> charge!=charge[_n+1] & _n<_N
> drop if todrop==1
> drop todrop
> 
> You would need to run this more than once if there
> are multiple matched 
> pos/beg pairs with the same values.  The hasnegative
> var is superfluous for 
> this approach since the only way that
> charge!=charge[_n-1] within the same 
> abscharge is if they differ in sign.
> 
> Michael Blasnik
> 
> 
> ----- Original Message ----- 
> From: "sara borelli" <saraborelli77@yahoo.it>
> To: <statalist@hsphsun2.harvard.edu>
> Sent: Wednesday, March 07, 2007 12:37 PM
> Subject: Re: st: Re: eliminate negative values and
> their positive 
> counterpart
> 
> 
> > Hi Michael,
> >
> > I am sorry to write again about the question of
> > yesterday
> > I am not sure how I would change the code you
> > suggested in the following case:
> >
> > claimnum   personid  servdate     charge     proc
> > 4087      1000124    2001-06-06   +25274.25   121
> > 4510      1000124    2001-06-06   -25274.25   121
> > 4511      1000124    2001-06-06   +25274.25   121
> >
> > If I want to eliminate the negative charge AND
> both
> > positive counterparts I just type drop if
> > hasnegative==1.
> >
> > The problem is that I might need to drop the
> negative
> > and only one of the positive counterparts, but the
> > only variable that can distinguish between the two
> > positives is claimnum, which cannot be used to
> define
> > a group since it is unique to each observation
> >
> > thank you in advance
> > Sara
> 
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