--- Yaseen Ghulam <[email protected]> wrote:
> Thanks Richard. I agree with you that one option is to run the
> routine in stata. But unfortunately stata does not support some
> methods which I am using or will need lot of programming which I am
> not comfortable. To be specific I am interesting in using lincom and
> nlcom routines. I feel that if I can bring beta, standard error into
> stata etc. then I should be able to use these functions. But I am not
> sure where to put these information in stata system file which nlcom
> can use.
The standard errors alone will not do, you will need the entire
variance covariance matrix. If you have that, you can do something like
this:
*------- begin example ---------------
capture program drop coefin
program define coefin, eclass
matrix b = 1, 2, 3
matrix colnames b = foo bar blup
matrix V = 3, -1, -1 \ ///
-1, 2, -1 \ ///
-1, -1, 1
matrix colnames V = foo bar blup
matrix rownames V = foo bar blup
ereturn post b V
ereturn local cmd "coefin"
end
coefin
nlcom _b[foo]/_b[bar]
*----------- 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 )
-- 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 Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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