Thank you!
/Lina Jonsson
> -----Ursprungligt meddelande-----
> Fr�n: [email protected]
> [mailto:[email protected]] F�r Maarten buis
> Skickat: den 11 september 2008 10:04
> Till: [email protected]
> �mne: Re: st: Using test after nl - not working
>
> --- Lina Jonsson <[email protected]> wrote:
> > I'm using nl and would like to test equality between two
> coefficients
> > after estimation. According to the Stata manual test is available
> > after nl but I can't seem to get it to work.
>
> The trick is to find out how Stata is calling your
> parameters. The easiest way is to type -matrix list e(b)-
> after you estimated your model. In this case you will find
> out that each parameter is a constant
> (_cons) in it's own equation. Within the test syntax you
> refer to such a parameter as [equation name]variable name .
> Notice that the variable is in this case _cons and not the
> variable in the -nl- command. See the example below.
>
> *-------------- begin example ----------------------- sysuse
> auto, clear nl (price = exp({b0} + {b1}*foreign +
> {b2}*weight) ) matrix list e(b) test [b1]_cons = [b2]_cons
> *----------------- end example ---------------------- (For
> more on how to use examples I sent to the Statalist, see
> http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
>
> Hope this helps,
> Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology Vrije Universiteit
> Amsterdam Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room N515
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
>
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>
*
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