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Re: st: RE: RE: Using variables in numlist of forvalue command


From   Nick Winter <nw53@cornell.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: RE: Using variables in numlist of forvalue command
Date   Wed, 08 Jun 2005 13:05:51 -0400

At least the advice was convergent, if not *precisely* identical.

--Nick W



It 12:56 PM 6/8/2005, you wrote:
Oh shucks, I see that Nick Winter has already
sent the same advice.

Nick
n.j.cox@durham.ac.uk

Nick Cox

> You can't put a variable into a numlist
> in this way.
>
> Try something like
>
> su daysupply, meanonly
> forvalues daynum = 2/`r(max)' {
>       replace date`daynum' = date1 + `daynum' - 1 if `daynum'
> <= daysupply
> }
>
> You may know the maximum in advance, so that you
> can simplify to say
>
> forvalues daynum = 2/10 {
>       replace date`daynum' = date1 + `daynum' - 1 if `daynum'
> <= daysupply
> }
>
> Nick
> n.j.cox@durham.ac.uk
>
> Shawn.Fultz@med.va.gov
>
> I'm trying to change several variables in each observation.
> The problem is that the number of variables I want to update
> is different for each observation and this number is a
> variable in that observation. I've tried using a forvalues
> loop, which works if I specify a stop and start number, but I
> cannot find a way to put a variable in the numlist allowing
> this to change for each observation.
>
> Here's the command that works:
>         forvalues daynum = 2/10 {
>         replace date`daynum'=date1+`daynum'-1
>         }
>
> But when I replace the 10 with the variable that tells me how
> many date variables to change, I get a syntax error.
>         forvalues daynum = 2/daysupply {
>         replace date`daynum'=date1+`daynum'-1
>         }

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--------------------------------------------------------
Nicholas Winter                           607.255.8819 t
Assistant Professor                       607.255.4530 f
Department of Government              nw53@cornell.edu e
308 White Hall            falcon.arts.cornell.edu/nw53 w
Cornell University
Ithaca, NY 14853-4601

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