diff --git a/assets/stan_demos/ar_k.stan b/assets/stan_demos/ar_k.stan
new file mode 100644
index 0000000..3de67f4
--- /dev/null
+++ b/assets/stan_demos/ar_k.stan
@@ -0,0 +1,16 @@
+data {
+  int<lower=0> K;  // model order
+  int<lower=0> N;  // dataset size
+  vector[N] y;
+}
+parameters {
+  real alpha;
+  row_vector[K] beta;
+  real sigma;
+}
+model {
+  for (n in (K+1):N) {
+    real mu = alpha + (beta * y[n-K:n]);
+    y[n] ~ normal(mu, sigma);
+  }
+}