If there are m i observations in a subpopulation i, then the probability distribution of the number falling into the k categories y i = (y i1, y i2, ... y ik) can be modeled by the multinomial ...
In addition, the ESTIMATE statement is now supported. The new DIST=NEGBIN option in the MODEL statement specifies the negative binomial distribution, and the DIST=MULT option specifies the multinomial ...