<>
"-ds- seems to be on the verge of extinction."
See Nick`s recent statement number 7 to the contrary here:
http://www.stata.com/statalist/archive/2009-08/msg00899.html
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Jeph Herrin
Gesendet: Donnerstag, 27. August 2009 21:02
An: [email protected]
Betreff: st: listing variables with certain characteristics
I have often found it helpful to keep track of
metadata associated with variables by assigning
it as characteristics. So, for instance, a variable
which is of type checkbox, in module 6, question 3
of a survey might have
myvar[type]: checkbox
myvar[module]: 6
myvar[question]: 3
and so on. What I'm looking for is a good way to
generate a list of variables that have, eg, module=6.
Right now, the best I can do is
ds, has(char module)
to get the list of variables that have a "module"
characteristic, then loop over that list to pick
out the ones where module=6. This bothers me because
(a) it seems there should be a better way than looping
and (b) -ds- seems to be on the verge of extinction.
I'm about to write my own utility to do this, since
I need to do it so often, but thought I'd see if there
wasn't a better way already out there. Is there a
a direct way to get a list of variables where the
characteristic exists and has a certain value?
thanks,
Jeph
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