Simpsons paradox update (#298)

* create truncated regression example

* delete truncated regression example from main branch

* create truncated regression example

* delete truncated regression example from main branch

* create truncated regression example

* delete truncated regression example from main branch

* first update of simpsons paradox notebook

* fix posterior predictive shape issues + hide some cell inputs

* suppress an output and add a tag

* fix divergences

* label mu in first model

* remove keep_dims

Co-authored-by: Benjamin T. Vincent <drbenvincent@users.noreply.github.com>

Author: Benjamin T. Vincent

examples/generalized_linear_models/GLM-simpsons-paradox.ipynb

@@ -955,7 +955,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.7"
+   "version": "3.9.9"
   }
  },
  "nbformat": 4,