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Gaussian Mixture Model for Stan
data {
int<lower=1> N;
int<lower=1> k;
real X[N];
parameters {
simplex[k] theta;
real mu[k];
model {
real ps[k];
for (i in 1:k){
mu[i] ~ normal(0, 1.0e+2);
for(i in 1:N){
for(j in 1:k){
ps[j] <- log(theta[j]) + normal_log(X[i], mu[j], 1.0);
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