Add DataFrame and Series median method
#9483
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ian-r-rose
reviewed
Sep 12, 2022
7 tasks
jrbourbeau
changed the title
DataFrame.median methodDataFrame.median method
ian-r-rose
reviewed
Sep 13, 2022
ian-r-rose
approved these changes
Sep 13, 2022
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Test failure is a known flaky one #8816 |
jrbourbeau
changed the title
DataFrame.median methodDataFrame and Series median method
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Thanks for reviewing @ian-r-rose! |
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This PR adds new
medianandmedian_approximatemethods todask.dataframe.Previously there was hesitation around using approximate algorithms in a
DataFrame.medianmethod, which could lead to confusion for users who are expectingdaskandpandasto always return the same result. This PR proposes we usemedianin cases where we can provide an exact median calculation (i.e. whenaxis=1or when there's only a single partition in theDataFrame/Series). Otherwise, we raise an informative error directing users tomedian_approximateand (internally) use the existing approximatequantilesimplementation.Closes #4362, supersedes #3819
TODO:
dd.SeriesAdd median to groupby aggregationsTo reduce the scope of this PR, let's handle this in as a follow-up