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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