Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

SV: st: Using test after nl - not working


From   "Lina Jonsson" <lina.jonsson@vti.se>
To   <statalist@hsphsun2.harvard.edu>
Subject   SV: st: Using test after nl - not working
Date   Thu, 11 Sep 2008 11:09:03 +0200

Thank you! 

/Lina Jonsson

> -----Ursprungligt meddelande-----
> Från: owner-statalist@hsphsun2.harvard.edu 
> [mailto:owner-statalist@hsphsun2.harvard.edu] För Maarten buis
> Skickat: den 11 september 2008 10:04
> Till: statalist@hsphsun2.harvard.edu
> Ämne: Re: st: Using test after nl - not working
> 
> --- Lina Jonsson <lina.jonsson@vti.se> 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/
> -----------------------------------------
> 
> 
>       
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index