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Re: st: foreach and postfile


From   Simon Moore <simoncmoore@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: foreach and postfile
Date   Thu, 13 Dec 2007 11:38:03 +0000

Very many thanks Maarten it works very well! I had not come across the very useful _rc before. I also added the option asis to the logit just to capture the last few stragglers.
All the best
Simon



Maarten buis wrote:

--- Simon Moore <simoncmoore@gmail.com> wrote:

I'm running something along the lines of:-

postfile coef id var1 var2 var3 using "`dir'\fit.dta", replace
foreach num of numlist 1(1)1000 {
qui logit expcont var1 var2 var3 if id == `num'
post coef (`num') (_b[var1]) (_b[var2]) (_b[var3])
}
postclose coef

occasionally the logit does not work as planned, gives an error (e.g.

"[var] not found") and the foreach loop grinds to a halt. I would
much rather capture the error somehow, post it to the file coef and
have the loop move onto the next iteration.
what about this:
*--------------- begin example -----------------
sysuse auto, clear

/*-logit- for foreign on the subsamples*/
/*rep78==1 and rep78==2 will fail*/
tab rep78 foreign

tempname memhold
tempfile results

postfile `memhold' id mpg ok using `results'
forvalues num = 1/5 {
capture logit foreign mpg if rep78 == `num'
if _rc > 0 {
post `memhold' (`num') (.) (0) }
else {
post `memhold' (`num') (_b[mpg]) (1) }
}
postclose `memhold'
use `results', clear
list
*-------------------- end example --------------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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