fixed bug in IV estimator for continuous IV

2019-07-27 19:12:41 +05:30 · 2019-07-27 19:12:41 +05:30 · 718dcde328
--- a/docs/source/dowhy_estimation_methods.ipynb
+++ b/docs/source/dowhy_estimation_methods.ipynb
--- a/dowhy/causal_estimators/instrumental_variable_estimator.py
+++ b/dowhy/causal_estimators/instrumental_variable_estimator.py
@ -47,7 +47,7 @@ class InstrumentalVariableEstimator(CausalEstimator):
        else:
            # Obtain estimate by 2SLS estimator: Cov(y,z) / Cov(x,z)
            num_yz = np.cov(self._outcome, instrument)[0, 1]
-            deno_xz = np.cov(self._outcome, instrument)[0, 1]
+            deno_xz = np.cov(self._treatment, instrument)[0, 1]
            iv_est = num_yz / deno_xz

        estimate = CausalEstimate(estimate=iv_est,