Re: AW: AW: st: RE: variable naming problem

[Thomas <tpt21@cam.ac.uk>]

I would like to predict at certain values (e.g. the mean, 0.5*mean, 
2*mean, etc).
Thomas



On 07/09/2010 09:58, Martin Weiss wrote:
> <>
>
> The server has increased its "appetite for the first lines" again, Thomas,
> so maybe you could send your message anew?
>
>
>
> HTH
> Martin
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Thomas
> Gesendet: Dienstag, 7. September 2010 10:44
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: AW: st: RE: variable naming problem
>
> Thomas
>
>
> On 06/09/2010 16:33, Martin Weiss wrote:
> > <>
> > " To get a prediction at a specific point using -predict- I suppose I need
> > the if option."
> >
> >
> > I am not so sure: Do you want to restrict the observations for which you
> > -predict-, or do you want to hold variables at certain values?
> >
> >
> >
> > HTH
> > Martin
> >
> > -----Ursprüngliche Nachricht-----
> > Von: owner-statalist@hsphsun2.harvard.edu
> > [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Thomas
> > Gesendet: Montag, 6. September 2010 17:10
> > An: statalist@hsphsun2.harvard.edu
> > Betreff: Re: st: RE: variable naming problem
> >
> > respect to the things over which the loop runs.
> > And these things are numbers. I do not see how I can name differently.
> >
> > To get a prediction at a specific point using -predict- I suppose I need
> > the if option. But as the model is quiet long and many variables drop
> > out -generate- involves less code.
> >
> > Thomas
> >
> >
> > On 06/09/2010 15:45, Nick Cox wrote:
> > > Only decimal points are problematic. Integer digits are allowed in
> > variable names after the first character. The remedy is to use evocative
> > names rather than numbers nevertheless. Only you can decide which names
> are
> > best for your purpose.
> > > Why aren't you using -predict-?
> > >
> > > Nick
> > > n.j.cox@durham.ac.uk
> > >
> > > Thomas
> > >
> > > after a regression I would like to generate predictions for different
> > > values of the original variables.
> > >
> > > The first loop generate various scaled mean values.
> > >
> > > The second and third loop then generate the predictions c* for the
> > > various scaled means.
> > >
> > > The problem is how to name c*. Now the names include numbers which Stata
> > > does not accept (error: invalid name).
> > >
> > > Any ideas how I can get around this?
> > >
> > > ________________
> > >
> > > foreach var of varlist yU yD{
> > >         sum `var' if e(sample)
> > >         local m`var' = `r(mean)'
> > >         local m25`var' = 0.25*`r(mean)'
> > >         local m50`var' = 0.5*`r(mean)'
> > >         local m75`var' = 0.75*`r(mean)'
> > >         local m2`var' = 2*`r(mean)'
> > >         local m3`var' = 3*`r(mean)'
> > >         local m4`var' = 4*`r(mean)'
> > >         }
> > >
> > >         foreach i in `myU' `m25yU' `m50yU'{
> > >             foreach p in `myD' `m25yD' `m50yD'{
> > >                 gen c`i'_`p' = _b[_cons]+_b[yU]*(`i')+_b[yU2]*((`i')^2/2)
> > ///
> > >                 +_b[yD]*(`p')+_b[yD2]*((`p')^2/2) if e(sample)
> > >             }
> > >         }
> > >
> > >
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