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

 From Kyle Hood To statalist@hsphsun2.harvard.edu Subject Re: st: RE: how to generate a variable using the estimation results Date Fri, 3 Nov 2006 11:10:23 -0500 (EST)

```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=???

```*
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```
```*
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```
```*
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```