In probability theory, the multinomial distribution is a generalization of the binomial distribution.

In statistics and econometrics, the multinomial probit model is a generalization of the probit model used when there are several possible categories that the dependent variable can fall into.

Expansion formula for powers of sums.

In statistics, multinomial logistic regression is a classification method that generalizes logistic regression to multiclass problems, i.e. with more than two possible discrete outcomes.

the statistical test of the null hypothesis that the parameters of a multinomial distribution equal specified values; it is used for categorical data.