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st: nlcom and delta method


From   Beatrice Crozza <beatrice.crozza@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: nlcom and delta method
Date   Tue, 3 Aug 2010 17:35:03 +0100

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. Interval]
-------------+----------------------------------------------------------------
          a |   .3697282   .0196595    18.81   0.000     .3311963    .4082601
------------------------------------------------------------------------------

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?

Thanks.

Best,
Bea
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