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st: RE: how can I pass a parameter to gengammareg?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: how can I pass a parameter to gengammareg?
Date   Mon, 8 Mar 2010 15:50:05 -0000

I don't know precisely what you mean by "manually", but it can't be an answer, as 
-gengammareg- doesn't know where the values come from. 

clear 
set obs 1000
forval s = 1/10 {
	gengammareg t_`s', s(`s')
}

works fine, for example. 

I don't know what r(est) is doing here. -streg- is not r-class. 

Nick 
n.j.cox@durham.ac.uk 

Matteo Richiardi

I'm trying to use the gengammareg ado file within the minbound
command, but although everything seems working (separately), the
program doesn't work.
This is what I have written:

********************************
capture program drop simulation
program simulation, rclass
       version 10
      args s
       capture drop t_sim
       gengammareg t_sim, kappa(1) sigma(`s')
       // stset the data and fit a Weibull regression model
       stset t_sim
       streg, distribution(weibull)
       scalar s_hat_sim = r(est)
       return scalar diff = s_hat_sim - .5
end

// MINIMIZATION
minbound simulation, range(.01 1) trace

********************************

And this is what I get from Stata:

failure running quadratic on x =          .01

It seems as gengammareg accepts parameters only manually. Any idea on
how I can get round of this problem? Thanks so much for support,


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