<>
"No, this is because these numbers are going to HUGE..."
Weirdly though, it also happens when the result is "1.9944475"...
*************
clear*
set obs 10000
set seed 12345
gen x1=rnormal()
gen x2=rnormal()
gen y=0.2+.03* x1+.01* x2 +rnormal()
reg y x?
di exp(_b[_cons]+_b[x2]*15.3)* /*
*/ exp(e(rss)/e(df_r)/2)
nlcom exp(_b[_cons]+_b[x2]*15.3)* /*
*/ exp(e(rss)/e(df_r)/2)
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]] Im Auftrag von Maarten buis
Gesendet: Dienstag, 3. November 2009 15:23
An: [email protected]
Betreff: Re: st: question
--- On Tue, 3/11/09, Tunga Kantarci wrote:
> I wish to calculate a figure where I call coefficient
> estimates and residuals sum of squares and degrees of
> freedom. All these quantities are from the stata
> estimation output. When I run the relevant command
> -nlcom exp(_b[_cons]+_b[income]*15.3)*exp(e(rss)/e(df_r)/2)-
>I get the error "could not calculate numerical derivative".
> This is perhaps because e(rss) and e(df_r) are not estimates.
No, this is because these numbers are going to HUGE, so huge
that in many cases a computer can't contain that number. This
to me suggest a conceptual error rather than a Stata error:
why do you want to do this?
-- Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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