Ah, the foibles of untested code... Thanks, Nick, for the catch!
Tom
Thomas J. Steichen
steicht@rjrt.com
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Facts do not cease to exist because they are ignored. - Aldous Huxley
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> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Tuesday, July 12, 2005 5:47 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: Replace
>
>
> Tom's major point is correct.
>
> His example won't work, however,
> as -in- requires absolute observation numbers and
> is not compatible with -by-.
>
> by id: replace temp=temp[6] if _n == 2
>
> would work.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Steichen, Thomas J.
>
> > Simply put, Leny, it doesn't work because it is illegal syntax.
> >
> > Stata does not allow references to record numbers on the left
> > of the equals sign. As the error message indicates, Stata
> interprets
> > the [2] as a possible weight indicator and notes that it is
> > not allowed in a replace command.
> >
> > You can, instead, used the -in- feature, such as:
> >
> > by id: replace temp=temp[6] in 2
> >
> > to replace the second element of temp (within each group
> > defined by id)
> > by the 6th element of temp (again, within each group defined by id).
>
> Leny Mathew
>
> > > Thank you Thomas, the code works. I still am curious as
> > > to why the
> > > following doesn't work.
> > >
> > > by id: replace temp[2]=temp[6]
> > >
> > > Stata gives me an error that weights are not allowed.
>
> *
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
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