This function is a returns a family and is a generalization of binomial.
users would only need to call it when calling change with
what = "family", to = multinomial(link = 'logit')
character string among those supported by binomial
Author
Ben Goodrich and Jonathan Kropko, for this version, based on earlier versions written by Yu-Sung Su, Masanao Yajima,
Maria Grazia Pittau, Jennifer Hill, and Andrew Gelman.
Details
This function is mostly cosmetic. The family slot for an object of
unordered-categorical-class must be multinomial(link = 'logit'). For
an object of ordered-categorical-class but not its subclasses, the family
slot must be multinomial() but the link function can differ from its default ("logit")