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st: generate newvar with the -foreach- command


From   Michael Kalinowski <mkmfg@web.de>
To   statalist@hsphsun2.harvard.edu
Subject   st: generate newvar with the -foreach- command
Date   Sun, 07 May 2006 01:49:42 +0200

Dear Stata-listers,

I just started to use Stata and I would like how to generate new variables with the -foreach- command. 
However, it's not that easy I thought...

Here is an example: 
In order to get the precent values in this dataset (time-series 1990-2004)I would like to generate  new variables:
c_bb*= a_bb*/b_bb* if *==*, where * is the varname extension:

c_bb01=a_bb01/b_bb01
c_bb03=a_bb03/b_bb03
c_bb10=a_bb10/b_bb10
c_bb11=a_bb11/b_bb11
c_bb20=a_bb20/b_bb20
.
.
.
a_bb995/b_bb995=c_bb995

I tried this, but it does not work. I suppose it's because of  the "*==*" expression:

. foreach var of newvarlist c_bb* {
2. gen c_bb*=a_bb*/b_bb* if *==*
3. format c_bb* %9,4f 
4.}

invalid syntax
r(198);

I could do it with the -generate- command, but it would be quite complicated, there are a lot of variables.

gen c_bb1=.
replace c_bb01=a_bb01/b_bb01
.
.
.
replace c_bb20=a_bb20/b_bb20


gen f_bb1=.
replace f_bb01=d_bb01/e_bb01
.
.
.
replace f_bb20=d_bb20/e_bb20



Any suggestions how to do it with foreach?

Thanks,
Michael
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