Simpson paradox example notebook (#182)

* initial commit of Simpson's paradox notebook

* reparameterisation

* model 3 - add group level slope and intercept

* fix arviz typo, add summary paragraph

* remove warning, add [np.newaxis, :] to fix arviz warnings

* fixed pp_y shape issues

* change 'random' to 'independent' slopes and intercepts

Author: drbenvincent

examples/generalized_linear_models/GLM-simpsons-paradox.ipynb

@@ -28,6 +28,7 @@ Gallery.contents = {
     "generalized_linear_models/GLM-robust": "(Generalized) Linear and Hierarchical Linear Models",
     "generalized_linear_models/GLM-rolling-regression": "(Generalized) Linear and Hierarchical Linear Models",
     "generalized_linear_models/GLM-truncated-censored-regression": "(Generalized) Linear and Hierarchical Linear Models",
+    "generalized_linear_models/GLM-simpsons-paradox": "(Generalized) Linear and Hierarchical Linear Models",
     "gaussian_processes/GP-Kron": "Gaussian Processes",
     "gaussian_processes/GP-Latent": "Gaussian Processes",
     "gaussian_processes/GP-Marginal": "Gaussian Processes",