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Re: st: -predict- in a system of equations


From   "R.E. De Hoyos" <redeho2@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: -predict- in a system of equations
Date   Sat, 22 May 2004 19:36:13 +0100

Ada and Michael, thanks for your advice.

-estimates- is exactly what I was looking for.

Best,
Rafa
______________________________
R.E. De Hoyos
Department of Applied Economics
University of Cambridge
Cambridge, CB3 9DE, UK
Tel: +44 1223 335269


----- Original Message -----
From: "Ada Ma" <pec187@abdn.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Saturday, May 22, 2004 5:52 PM
Subject: Re: st: -predict- in a system of equations


> Hi Rafa,
>
> I'm going to make another rustic suggestion after reading your email to
Michael
> Blasnik, again it might not be of much use.  My suggestion is:
>
> How about if you -append- data1.dta and data2.dta?  (And plug in a dummy
in
> data2.dta before you -append-.)
>
> Hope it helps.
> Ada
>
>
>
> R.E. De Hoyos wrote:
> > Michael,
> >
> > Thanks for your answer.
> >
> > -predict- wont work because several equations are being estimated.
Suppose I
> > estimate -heckman- using data1.dta, then a vector e(b) is created in
> > which -predict- is based on. Once a second equation is estimated,
> > e.g. -mlogit- a new vector is created, let's say to e(b') and the old
one is
> > being lost. When I change to data2.dta I want to be able to predict (or
> > score) using both e(b) and e(b'), therefore I needed a way to save these
> > vectors, which your suggestion is doing very well.
> >
> > It would be quite useful to have an option to save all the -predict-
> > properties (at least temporary) to use them in an alternative dataset.
> > With -matrix score- I can only form linear combinations of the
previously
> > saved vectors e(b)s and the new Xs, while I might be more interested in
the
> > fitted probabilities (as in the case of limited dependant variables eq.)
> >
> > Thanks again,
> >
> > Rafa
> >
> >
>
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