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st: how to drop duplicate values
From
Malin Lundberg Rasmussen <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: how to drop duplicate values
Date
Fri, 14 Sep 2012 13:53:38 +0200
My problem:
I have a cohort of patients with a severity grade for each eye. I am only going to use one eye, and I want it to be the eye with a certain grade, say 2.
I have made the variable long, so the data looks like this:
1. id:1 var*:2
2. Id:1 var*:2
3. Id:2 var*:2
4.Id2: var*:3
I use the command
Keep if var*==2
But then I have some patients who have the same grade in both eyes.
1. id:1 var*:2
2. Id:1 var*:2
3. Id:2 var*:2
How do I drop these? (in the above list 1 or 2).
Hope anyone has the answers?!
Best regards
Malin Rasmussen
Med venlig hilsen
læge, ph.d.-studerende
Malin Lundberg Rasmussen
Øjenafdeling E, OUH
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