Statalist The Stata Listserver

[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

RE: st: Unknown function () error.

From   "Nick Cox" <>
To   <>
Subject   RE: st: Unknown function () error.
Date   Wed, 30 Aug 2006 16:21:04 +0100

Literature aside, what you want in your program is 
a definition of the log likelihood function, not of 
the likelihood function. Recall that multiplications
in the likelihood reduce to additions in the log 


Partha Deb
> You could look up Cameron and Trivedi on counts or 
> microeconometrics, Greene 
> (I think), the Stata manual entry for nbreg, etc. for the 
> density function 
> and/or likelihood function for a negative binomial.  Sorry I 
> can't be more 
> specific because I don't have these books handy.
Vimalanand S. Prabhu wrote:
> > Can you please make any suggestions as to how I can proceed?

Partha Deb wrote:

> >> Watch the # - I think you want * .
> >>
> >> Also, this isn't the likelihood function for a NB unless you do 
> >> something more with uu.  As specified, since uu is a 
> constant, it's a 
> >> Poisson with an additional constant (and hence not identified).
> >>

*   For searches and help try:

© Copyright 1996–2017 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index