n*p x k Design matrix (p is number of choice alts)
beta
k x 1 coefficient vector
Value
a list containing:
yn x 1 vector of multinomial outcomes (1, ..., nrow(X)/n)
XDesign matrix
betacoefficient vector
probn x p array of choice probs
Warning
This routine is a utility routine that does not check the
input arguments for proper dimensions and type.
References
For further discussion, see Bayesian Statistics and Marketing
by Allenby, McCulloch, and Rossi.
http://gsbwww.uchicago.edu/fac/peter.rossi/research/bsm.html