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DOC: sample variance -> population variance (#46482) #46711

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Merged
merged 6 commits into from
Apr 27, 2022
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DOC: sample variance -> population variance (#46482) #46711

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2981bc5
DOC: sample variance -> population variance (#46482)
kwhkim Apr 9, 2022
83bb658
Merge remote-tracking branch 'upstream/main'
kwhkim Apr 14, 2022
e6fc01a
DOC: population variance wiki link added (#46710)
kwhkim Apr 14, 2022
b1521ea
Merge remote-tracking branch 'upstream/main'
kwhkim Apr 26, 2022
b4f97fe
DOC: Index w/ duplicate into set (#46440)
kwhkim Apr 26, 2022
6505682
Revert "DOC: Index w/ duplicate into set (#46440)"
kwhkim Apr 26, 2022
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2 changes: 1 addition & 1 deletion doc/source/user_guide/gotchas.rst
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Expand Up @@ -367,7 +367,7 @@ integer arrays to floating when NAs must be introduced.
Differences with NumPy
----------------------
For :class:`Series` and :class:`DataFrame` objects, :meth:`~DataFrame.var` normalizes by
``N-1`` to produce unbiased estimates of the sample variance, while NumPy's
``N-1`` to produce `unbiased estimates of the population variance <https://en.wikipedia.org/wiki/Bias_of_an_estimator>`__, while NumPy's
:meth:`numpy.var` normalizes by N, which measures the variance of the sample. Note that
:meth:`~DataFrame.cov` normalizes by ``N-1`` in both pandas and NumPy.

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