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st: ML programming


From   Daniel Lawson <dlawson@drew.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: ML programming
Date   Fri, 23 Mar 2007 16:11:26 -0400

Dear StataListers,

I have read [p] and maximum likelihood estimation with stata third
edition, but am a bit confused something.

In the ml model statement, one calls a program to evaluate the
likelihood.  Is there a way to pass arguments to this program that do
not correspond with theta parameters to be estimated by ml?

For instance, if I wanted to code a tobit command with a variable
censoring threshold, where the threshold for each observation was
contained in a variable, and the observation was censored if it
equaled that variable, but was not censored if it was less than that
variable, how can I pass the name of the threshold variable to the
function that calculated the likelihood?

I can hard-code the name of the threshold variable into the
likelihood function, or I could create a global macro with the name
of the threshold variable, but neither of these seem like elegant
solutions.  Is there a way to pass arguments to the likelihood
function in ml without making ml think that the argument is another
parameter to be computed?

Peace,
Daniel Lawson

--
Daniel Lawson
Assistant Professor of Economics
Drew University
http://users.drew.edu/dlawson/



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