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st: Categorize variable with percentile valor of other variable


From   Xavi Barber <xbarber@altern.org>
To   statalist@hsphsun2.harvard.edu
Subject   st: Categorize variable with percentile valor of other variable
Date   Tue, 06 Apr 2004 10:27:57 +0200

Dear statalisters:

I have a programming doubt.

This is my program:

********************************************************
pctile varPCT=var if var2==XXX, nq(4)

scalar p25=r(r1)
scalar p50=r(r2)
scalar p75=r(r2)

egen var4c=cut(var), at(p25, p50, p75)

scalar drop p25 p50 p75
drop varPCT

********************************************************

But Stata return a error --> " at (..) invalid "

I think in a new program but I don't like it.

***********************************************************
pctile varPCT=var if var2==XXX, nq(4)

scalar p25=r(r1)
scalar p50=r(r2)
scalar p75=r(r2)

gen var4c=1 if var<p25
replace var4c=2 if (var>=p25 & car<p50)
replace var4c=3 if (var>=p5 & car<p75)
replace var4c=4 if (var>=p75)

scalar drop p25 p50 p75
drop varPCT
***********************************************************

My question is: Which is the best method to categorize variable with percentile of other variable????

Thanks


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