Add support for axis=None in reductions #16229
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Matt711
commented
Jul 10, 2024
| return getattr(concat_columns(source._data.columns), op)( | ||
| **kwargs | ||
| ) | ||
| elif axis == 2 and op in {"std", "var"}: |
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How should std and var reductions be treated? I think 1. is right, but I wanted to check.
- Combine the columns, then compute the reduction
- Compute the reduction over columns, then compute the reduction again over those results
cc. @mroeschke, @vyasr
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In regards to 1, we do have to keep this comment in mind: #14930 (comment)
In terms of correctness, I forgot if std and var validate the minimum number of elements in the columns, but if so, the logic for axis=None should be something like.
if self.size < minimum_std_var_elements: Return NAif len(self) < minimum_std_var_elements and self.size > minimum_std_var_elements: Your option 1else: Your option 2
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Description
Closes #12335
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