Merge pull request #337 from NathanielF/add_dag_fix_bug

add Propensity Score DAG as Quasi-Experiment writeup

causalpy/pymc_models.py

@@ -453,11 +453,17 @@ def fit(self, X, t, coords):
         distributions. We overwrite the base method because the base method assumes
         a variable y and we use t to indicate the treatment variable here.
         """
+        # Ensure random_seed is used in sample_prior_predictive() and
+        # sample_posterior_predictive() if provided in sample_kwargs.
+        random_seed = self.sample_kwargs.get("random_seed", None)
+
         self.build_model(X, t, coords)
         with self:
             self.idata = pm.sample(**self.sample_kwargs)
-            self.idata.extend(pm.sample_prior_predictive())
+            self.idata.extend(pm.sample_prior_predictive(random_seed=random_seed))
             self.idata.extend(
-                pm.sample_posterior_predictive(self.idata, progressbar=False)
+                pm.sample_posterior_predictive(
+                    self.idata, progressbar=False, random_seed=random_seed
+                )
             )
         return self.idata

causalpy/tests/test_pymc_experiments.py

@@ -63,7 +63,13 @@ def test_regression_kink_gradient_change():
 
 def test_inverse_prop():
     df = cp.load_data("nhefs")
-    sample_kwargs = {"tune": 100, "draws": 100, "chains": 2, "cores": 2}
+    sample_kwargs = {
+        "tune": 100,
+        "draws": 500,
+        "chains": 2,
+        "cores": 2,
+        "random_seed": 100,
+    }
     result = cp.pymc_experiments.InversePropensityWeighting(
         df,
         formula="trt ~ 1 + age + race",
@@ -93,7 +99,7 @@ def test_inverse_prop():
     assert isinstance(ate_list, list)
     ate_list = result.get_ate(0, result.idata, method="overlap")
     assert isinstance(ate_list, list)
-    fig = result.plot_ATE(prop_draws=10, ate_draws=10)
+    fig = result.plot_ATE(prop_draws=1, ate_draws=10)
     assert isinstance(fig, mpl.figure.Figure)
     fig = result.plot_balance_ecdf("age")
     assert isinstance(fig, mpl.figure.Figure)