st: Multinomial with Conditioning Variable unique to each response?

[Javier Miranda <javier.miranda@census.gov>]

I want to estimate a Multinomial Logit Model where one of the 
conditioning variables is unique across alternatives.
More specifically, say I want to model the probability of an event 
occurring in any of four years, 1982, 1983, 1984 and 1985.
Now, say one of the conditioning variables is unque across alternatives; 
for example, assume the interest rate differs each year.
Now, if I estimate this model and generate the predicted probabilities I 
end up with a set of probibilites for each interest rate by year.
This is not right. Any suggestions as to what model I should be looking at?

Thanks Much
--javier miranda

*
*   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/