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Re: st: RE: how to work around -levelsof- limits with Stata 9.2/SE?

From   "Ben Jann" <[email protected]>
To   [email protected]
Subject   Re: st: RE: how to work around -levelsof- limits with Stata 9.2/SE?
Date   Tue, 14 Oct 2008 13:49:38 +0200

I think it should be

 levelsof   ICER_round, loc(levels)
 foreach lev of local levels {
     generate result`lev' = `lev' * Delta_Q - Delta_C

However, are you really sure you want to generate 10000 variables?

Furthermore, should -levelsof- hits Stata's limits you could type

 mata: st_local("levels",

assuming that ICER_round is a numeric variable (-mormata- required,
type -ssc describe moremata-).


On Tue, Oct 14, 2008 at 1:24 PM, Martin Weiss <[email protected]> wrote:
> "levelsof may hit the limits imposed by your Stata.  However, it is
> typically used when the number of distinct values of varname is modest."
> (from -h levelsof-). I should have anticipated this problem. Are the levels
> of your "a" in any way regularly spaced (to enable application of
> -forvalues-)?
> Martin
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Carlo Lazzaro
> Sent: Tuesday, October 14, 2008 12:44 PM
> To: [email protected]
> Subject: st: how to work around -levelsof- limits with Stata 9.2/SE?
> Dear Statalisters,
> I have performed successfully Martin's helpful syntax using -levelsof- on a
> sample of 20 distinct values for var a.
> However, when I tried to repeat the loop for the total 10,000 levels of var
> a I got an error message(admittedly, the recommended limit for -levelsof- is
> a modest number of distinct values for varlist, so I cannot complain about
> this useful ado.file). Is there any way to work this around?
> Please find below the command lines I typed along with the error message I
> got at the end of the sequence:
> . levelsof   ICER_round, loc(levels) *around 10,000 levels are still
> reported after rounding to the nearest whole number
> . foreach lev of local levels {
>  2. g result`lev'=` ICER_round'* Delta_Q-  Delta_C
>  3. }
> invalid syntax
> r(198);
> Thanks a lot for your kindness and for your time.
> Kind Regards,
> Carlo
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