gaussian            real        normal_lpdf         1   sigma   positive
binomial            binary      bernoulli_lpmf      0
Gamma               positive    Gamma_lpdf          1   alpha   positive
poisson             count       poisson_lpmf        0
inverse.gaussian    real        inv_gaussian_lpdf   1   lambda  real
survival_Cox        survival    survival_Cox_lpdf   1   theta   real
survival_AFT        survival    survival_AFT_lpdf   1   sigma   positive
