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st: eliminate negative values and their positive counterpart


From   sara borelli <saraborelli77@yahoo.it>
To   statalist@hsphsun2.harvard.edu
Subject   st: eliminate negative values and their positive counterpart
Date   Tue, 6 Mar 2007 19:48:21 +0100 (CET)

dear satalist members,

This is an exctract of my data:

personid       charge     proc       date
1000124		+13	  80048	   6/6/2001
1000124		+13	  80076	   6/6/2001
...
1000124		+13	  80048	   6/7/2001
1000124		+13	  80076	   6/7/2001
...
1000124		-13	  80048	   6/7/2001
1000124		-13	  80076	   6/7/2001
...
1000124		+13	  80048	   6/8/2001
...
1000124		+13	  80048	   6/9/2001
...
1000124		+13	  81001	   6/11/2001
...
1000124		+13	  80048	   6/11/2001
1000124		+13	  80048	   6/12/2001

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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