Dear Clive,
I think that you can just do this:
webuse nlswork
reg ln_wage age race grade if year==68
predict r1, r
whitetst, fitted
forval i=69(1)88 {
reg ln_wage age race grade if year==`i'
predict r`i', r
reg r`i' L.r`i' /*change
r`i_[n-1]' to L.r`i'*/
whitetst, fitted
}
The result is the same of Rich Ochmann, but I'm not using a new local macro.
HTH,
Joao Lima
2008/12/9 Clive Nicholas <[email protected]>:
> Stata 9.2, Windows XP
>
> I'm having trouble executing this -forval- code:
>
> webuse nlswork
> reg ln_wage age race grade if year==68
> predict r1, r
> whitetst, fitted
> forval i=69(1)88 {
> reg ln_wage age race grade if year==`i'
> predict r`i', r
> reg r`i' r`i_[n-1]'
> whitetst, fitted
> }
>
> The problem, of course, is with -reg r`i' r`i_[n-1]'-, which chokes
> with the error code:
>
> r ambiguous abbreviation
> r(111);
>
> Even after checking -h forval-, I can't find a satisfactory way of
> getting Stata to automate the second residual term, which should be
> the one estimated for the year before the first one in each
> -regress-ion.
>
> All solutions gratefully received.
>
> --
> Clive Nicholas
>
> [Please DO NOT mail me personally here, but at
> <[email protected]>. Please respond to contributions I make in
> a list thread here. Thanks!]
>
> "My colleagues in the social sciences talk a great deal about
> methodology. I prefer to call it style." -- Freeman J. Dyson.
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>
--
----------------------------------------
Joao Ricardo Lima, D.Sc.
Professor
UFPB-CCA-DCFS
Fone: +553138923914
Skype: joao_ricardo_lima
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*
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