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st: Loop question


From   Alberto R Osella <arosella@irccsdebellis.it>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Loop question
Date   Tue, 08 Feb 2011 10:22:17 +0100

Dear Stata Listers,
after a factor analysis (pca)  I'd want to create categorical variables
by using a loop. But I have some troubles. Here the code I'm using

predict P_R1 P_R2 P_R3 P_R4, regression
predict P_B1 P_B2 P_B3 P_B4, bartlett

foreach x of var  P_R1-P_B4 {
pctile q_`x'_c= `x' if caso_ctrol0==0 &  P_R1-P_B4 <., nq(5)
tab2 `x' caso_ctrol0
xtile `x'_q=`x', cutpoint( P_R1-P_B4_cut)
tab2 `x'_q caso_ctrol0
   }
and this is the error:
variable P_B4_cut not found
in option cutpoints()
r(111)
I'm using Stata 11.1 on windows 7.
Can anyone help me. Thank you.

--
Alberto R. Osella, MD, PhD
Laboratorio di Epidemiologia e Biostatistica
IRCCS Saverio de Bellis
Via Turi, 27
70013 Castellana Grotte (BA)
Italia
Tel:    +39 0804994655
Fax:    +39 0804994650
e-mail: arosella@irccsdebellis.it

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