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st: RE: nlcom and delta method

From   "Dr. Martin Weiss" <>
To   <>
Subject   st: RE: nlcom and delta method
Date   Tue, 3 Aug 2010 18:50:17 +0200


You have to -post- the result:

sysuse auto, clear
reg price weight length trunk
nlcom (a: _b[weight]/_b[trunk]), post
di _b[a]


-----Original Message-----
[] On Behalf Of Beatrice Crozza
Sent: Dienstag, 3. August 2010 18:35
To: statalist
Subject: st: nlcom and delta method

Dear All,

I did a maximum likelihood, using delta method, to get the values.

So, for example, one result of my maximum likelihood using delta
method is this one:

. nlcom (a: 1/(1+exp(-[ar]_b[_cons])))

          a:  1/(1+exp(-[ar]_b[_cons]))

             |      Coef.   Std. Err.      z    P>|z|     [95% Conf.
          a |   .3697282   .0196595    18.81   0.000     .3311963

Now I wan to test a no linear combinations, using the coefficient of a
, however the usual command for the coefficient: _b[a] doesn't work.

What can I do in this case?


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