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

["Michael Blasnik" <michael.blasnik@verizon.net>]

Woops, typo on my 3rd line, should be egen, not gen:

bysort personid proc date abscharge : egen sumcharge=total(charge)

Michael Blasnik

----- Original Message ----- 
From: "Michael Blasnik" <michael.blasnik@verizon.net>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, March 06, 2007 2:15 PM
Subject: st: Re: eliminate negative values and their positive counterpart



> 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
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