This function can be used in the family argument of create_sampler
or generate_data to specify a multinomial sampling distribution. This
includes the special case of categorical (multinoulli) data.
f_multinomial(link = "logit", n.trial = NULL, K = NULL)A family object.
the name of a link function. Currently the only allowed link function
for the multinomial distribution is "logit".
the number of multinomial trials. This can be specified either as a formula for a variable number of trials, or as a scalar value for a common number of trials for all units.
number of categories for multinomial model; only used for prior predictive sampling.