Xskillscore

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Features
~~~~~~~~
- Add ``r2`` as an implementation of ``sklearn.metrics.r2_score``. `Ray Bell`_

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Bug Fixes
~~~~~~~~~
- Fixes https://github.com/xarray-contrib/xskillscore/issues/79 `assignment destination is read-only`
error when ``skipna=True`` and weights are passed. `Andrew Huang`_

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Internal Changes
~~~~~~~~~~~~~~~~
- ~30-50% speedup for deterministic metrics when ``weights=None``. `Aaron Spring`_

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Features
~~~~~~~~
- Add ``effective_sample_size``, ``pearson_r_eff_p_value``, and ``spearman_r_eff_p_value``
for computing statistical significance for temporally correlated data with
autocorrelation. `Riley X. Brady`_

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Deprecations
~~~~~~~~~~~~
- ``mad`` no longer works and is replaced by ``median_absolute_error``. `Riley X. Brady`_


Bug Fixes
~~~~~~~~~
- ``skipna`` for ``pearson_r`` and ``spearman_r`` and their p-values now reports
accurate results when there are pairwise nans (i.e., nans that occur in different
indices in ``a`` and ``b``) `Riley X. Brady`_


Testing
~~~~~~~
- Test that results from grid cells in a gridded product match the same value if their time
series were input directly into functions. `Riley X. Brady`_
- Test that metric results from ``xskillscore`` are the same value as an external package
(e.g. ``numpy``, ``scipy``, ``sklearn``). `Riley X. Brady`_
- Test that ``skipna=True`` works properly with pairwise nans. `Riley X. Brady`_


.. _`Aaron Spring`: https://github.com/aaronspring
.. _`Andrew Huang`: https://github.com/ahuang11
.. _`Dougie Squire`: https://github.com/dougiesquire
.. _`mcsitter`: https://github.com/mcsitter
.. _`Riley X. Brady`: https://github.com/bradyrx
.. _`Ray Bell`: https://github.com/raybellwaves
.. _`Taher Chegini`: https://github.com/cheginit
.. _`Zachary Blackwood`: https://github.com/blackary