Re: st: RE: how to generate a variable using the estimation results

[Kyle Hood <kyle.hood@yale.edu>]

what does the notation _b[/rho] do?  Why _b[]?  why /?

Kyle

On Fri, 3 Nov 2006, Oleksandr Shepotylo wrote:

> Thank you,
>
> I need this rho to transform my exogenous variables X(NxK) by mulitplying 
> them by the following matrix:
>
> X*=rho*W*X, where W is (NxN)
>
> so I planned to calcualte rho*X and use mata to calculate W*(rho*X).
>
> But you are right, I can save a scalar rho and use it in mata expressions 
> when I need it.
>
> Thanks,
>
> Oleksandr
>
> Nick Cox wrote:
>
>
> > This sounds like a bad idea. The parameter can be saved as a scalar or a 
> > local macro, but using a variable for
> > the same number again and again is usually unnecessary. 
> > Still, there might be a good idea, or you might insist, so if so try 
> > gen rho = _b[/rho] 
> > but consider also
> >
> > scalar rho = _b[/rho] 
> > Nick n.j.cox@durham.ac.uk 
> > Oleksandr Shepotylo
> >
> >
> >
> > > After non linear estimaition which estimates parameters rho and sigma of 
> > > the following form
> > >
> > > nl (z=h1*{rho}+h2*{rho}^2+h3*{sigma2}), in(rho -0.5 sigma2 1) iterate(200)
> > >
> > > I want to generate a variable rho that takes the value of the estimated 
> > > parameter {rho}
> > >
> > > gen rho=???
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/