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8. Hierarchical models
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Choose **one** of 8.2, 8.3, or 8.4 to complete as a solo problem. Problems 8.1 and 10.2a are due a week before the solo problem.

.. toctree::
   :maxdepth: 1

   hw8.1.ipynb
   hw8.2.ipynb
   hw8.3.ipynb
   hw8.4.ipynb
   hw10.2a.ipynb