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Re: st: -nlcom-, delta method, and the derivative


From   Kristian Karlson <kristian.karlson@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -nlcom-, delta method, and the derivative
Date   Sun, 23 Jan 2011 18:05:16 +0100

Bobby,
Thanks a bunch. That is a great help.
Kristian

Den 23-01-2011 17:55, Roberto G. Gutierrez, StataCorp skrev:
Not directly from -nlcom-, but you can get the equivalent from -testnl-, which
is called by -nlcom- anyway.

     . sysuse auto, clear
     . regress mpg foreign
     . nlcom (_b[foreign])2
     . testnl (_b[foreign])2  = 0

-testnl- returns the derivative matrix in r(G):

     . return list
     . mat list r(G)

the second element of which (the derivative of the expression wrt -foreign-,
the second coefficient of e(b)) will coincide with

     . di 2*_b[foreign]

--Bobby
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