I'm thinking about updating my -smfit- and -dagumfit- programs written
in Stata version 4 (sic!) to version 8.1, but am unclear about to
convert one key aspect of the -ml- program. These programs, fitting
parametric functional forms to distributions of data, are a little
unusual because they don't have a dependent variable with explanatory
variables in the way a regression model usually does, and fitting in
version 4 involved a particular "depv(000)" statement, thus:
~~~~~ado code extract ~~~~~~~~~~~~~~~~~~~
ml begin
ml func sm_ll
ml method deriv0
eq p1 :
eq p2 :
eq p3 :
ml model c = p1 p2 p3, depv(000) from(c0)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
What is the version 8.1 equivalent of the "trick" used here, please?
The "depv" option no longer exists.
[Note: the original programs simply fitted 3 parameter functional
forms. In the update, I would also like to make each parameter
optionally a function of covariates. The original programs are
available using -ssc-.]
TIA
Stephen
----------------------
Professor Stephen P. Jenkins <[email protected]>
Institute for Social and Economic Research (ISER)
University of Essex, Colchester, CO4 3SQ, UK
Tel: +44 (0)1206 873374. Fax: +44 (0)1206 873151.
http://www.iser.essex.ac.uk
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