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st: Generate quartile adjusted by subpopulation


From   Xavi Barber <xbarber@altern.org>
To   statalist@hsphsun2.harvard.edu
Subject   st: Generate quartile adjusted by subpopulation
Date   Mon, 05 Apr 2004 16:35:49 +0200

Dear statalister:

I have 4 subpopulation (group A (n=200), B(n=200), C(n=200), D(n=400))

I need to create a new categorical variable, this variables is the 4Q-tile of variable varXXX but the distribution of the quartile is according to subpopulation D.

I use the xtile & the xtile2 command, but I not sure than the new 4Q variable is ok.

FOR EXAMPLE:

xtile2 var4Q=varXXX , nq(4) by(grupD)

but grupD have 600 missing and the new variable var4Q have 400 observations and not 1000.

Can You help me?
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