Statalist The Stata Listserver


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

st: Unknown function () error.


From   "Vimalanand S. Prabhu" <prabhu@unc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Unknown function () error.
Date   Wed, 30 Aug 2006 10:35:10 -0400

Hi

I am new to ml command. I am getting an error: Unknown function (), when I run the following code for negative binomial count model. Is there any obvious error in the code which I seem to miss out.

The L function is -exp(lambda.ui).(lambda.ui)^yi/(yi)!

program define nbreg2
args lnf theta uu
quietly replace `lnf' = -exp(`theta')#`uu' + $ML_y1#(`theta'+ln(`uu')) - lnfact($ML_y1)
end
ml model lf nbreg2 (jdemh=price eff) ()
ml check
ml maximize

Thanks,

Prabhu
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index