data { int N; int K; matrix[N,K] X; vector[N] y; } parameters{ real a; vector[K] b; real<lower=0> sigma; //vector<lower=0>[K] sigma2; real<lower=0>[K] sigma2; } transformed parameters{ vector[N] mu; mu=X*b+a; // mu=X*b; } model{ //b ~ normal(0,sigma2); b ~ double_ex</lower=0></lower=0></lower=0>…