-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
--- On Mon, 16/3/09, Davide Cantoni <[email protected]> wrote:
> the problem in my file is not the line containing
>
> `command' `depvar' `regressors' `if'
> [`weight' `exp'] , `options'
>
> But rather two other lines:
>
> ***
> local regressors=trim("`regressors'")
> ***
>
> and
>
> ***
> local nr=wordcount("`regressors'")
> foreach k of numlist 1(1)`nr' {
> ...
> local regrs_no``k'' =
> subinword("`regressors'","``k''","",.)
> ...
> }
> ***
>
> But these two lines seem to be the stumbling stone.
The first you can solve by replacing it with
local regressors : list retokenize regressors
or
unab regressors : `regressors'
The latter also unabreviates the names of your regressors.
The second you can solve by replacing it with
local nr : word count `regressors'
tokenize `regressors'
forvalues k = 1/`nr' {
local regrs_no`k' = "``k''"
}
-tokenize- breaks the string contained in the local
`regressors' up in bits and puts them in the locals
`1', `2', `3', etc. Within the -forvalues- loop the
local `k' will sequentially contain the numbers 1,
2, 3, etc. So, if the first variable is called x,
then in the first itteration of this loop the line
-local regrs_no`k' = "``k''"- will read:
local regrs_no1 = "`1'"
This still contains a local macro, so Stata reads
again, and sees:
local regrs_no1 = "x"
That is why on the left side you only need `k'
and on the right side you need ``k''. You also
need the double quotes (" ") to make sure that
Stata knows that you want the variables name
and not the value of the first observation on
the variable x.
Hope this helps,
Maarten
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