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st: Help: typo-error in for-loop or more serious problem??


From   Ernest Berkhout <ernestb@seo.fee.uva.nl>
To   statalist@hsphsun2.harvard.edu
Subject   st: Help: typo-error in for-loop or more serious problem??
Date   Mon, 24 Feb 2003 15:28:01 +0100

Hi all,

i was looking for a way to cycle through all the values of a particular
variable 'oplnr' without having to hardcode these values (they changes
every year). Walking through some faqs I come across the program 'vallist'
which should be able to do this for me. I integrated this in a small
foreach-loop program, but I get an errormessage that does not make sense to
me. As I'm not very experienced in programming Stata, it might be some
silly typo which I overlooked, but I cant see what is is. Or is there maybe
some other problem unknown to me?

The basic idea is to create a set of dummy-variables for interactions
between to variables oplnr & brinnr. But not all combinations are
meaningful in practice, so for reason of efficiency I want to drop all
dummies that indicate 'empty cells', that is for which all records have a
zero-value.
The program stores the values of a variable 'oplnr' in some macro `oplnr',
and then I introduce another loop which should cycle through a second set
of values (1 to 13) stored in the macro `brinnr'.
The following is the code that I've written:
******************************
gen temp=.
vallist oplnr
foreach oplnr of local r(list)  {
       forvalues brinnr = 1/13     {
                gen byte opXbr_`oplnr'_`brinnr' = (oplnr==`oplnr' &
brinkort==`brinnr')
                qui summ opXbr_`oplnr'_`brinnr', meanonly
                replace temp=r(max)
                if temp==0  drop opXbr_`oplnr'_`brinnr'
       }
}
drop temp
********************************************

The error message I get is:

{ required
r(100)

Can someone please hint me what is wrong in my code? I do have 2 opening
and 2 closing brackets, why does that produce such an error?

Ernest Berkhout
Stichting voor Economisch Onderzoek
Universiteit van Amsterdam

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