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RE: st: Coding for multiple visits data


From   Tasha Amin <tamin_wh@hotmail.com>
To   Stata list <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Coding for multiple visits data
Date   Fri, 8 Apr 2011 20:16:18 -0400

A case is someone who has TWO successive study visits with 0 RNA. However, the way the data is currently coded means the person's entire case history is 1 or 0, instead of just at the visit when the person transitions.I'm including the data again, to indicate how ID 1 should be case=0 till visit 5 with visit 6 being case=1. That is, person 1 is a non-case till visit 6, when he changes.
Looks like:
ID visit RNA case
1 1 1 1 
1 3 1 1 
1 5 0 1 
1 6 0 1 
1 7 0 1 
2 1 1 0
2 2 1 0
2 3 1 0 
2 4 1 0

Want it to look like:
ID visit RNA case
1 1 1 0 
1 3 1 0 
1 5 0 1 
1 6 0 1 
1 7 0 1 
2 1 1 0
2 2 1 0
2 3 1 0 
2 4 1 0 
----------------------------------------
> Date: Fri, 8 Apr 2011 17:45:22 -0400
> Subject: Re: st: Coding for multiple visits data
> From: joerg.luedicke@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> I think it is not quite clear what exactly you want to do. What are
> the values in "case" supposed to indicate? And what is the relation
> between "case" and "RNA"? From all I can see given the information
> provided you would get the second set of example data by typing
> -replace case=0 if RNA==1-. But I guess this is not what you are
> looking for...
>
> J.
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