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BUG: RollingGroupBy.quantile ignores interpolation keyword argument #29567

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Merged
merged 6 commits into from
Nov 18, 2019
Merged

BUG: RollingGroupBy.quantile ignores interpolation keyword argument #29567

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352445c
BUG: `RollingGroupBy.quantile` ignores `interpolation` keyword argume…
pwsiegel Nov 12, 2019
8a5054d
Merge remote-tracking branch 'upstream/master' into rolling-groupby-q…
pwsiegel Nov 17, 2019
ed7aa3f
Create new test `test_rolling_quantile`
pwsiegel Nov 17, 2019
48cb4e5
Parametrize test_rolling_quantile with interpolation parameters
pwsiegel Nov 17, 2019
fde54ce
add parametrized test `test_expanding_quantile` and removed quantile
pwsiegel Nov 17, 2019
61c5142
Change format of method reference in bug description in whatsnew to be
pwsiegel Nov 17, 2019
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v1.0.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -427,6 +427,7 @@ Groupby/resample/rolling
- Bug in :meth:`DataFrame.groupby` not offering selection by column name when ``axis=1`` (:issue:`27614`)
- Bug in :meth:`DataFrameGroupby.agg` not able to use lambda function with named aggregation (:issue:`27519`)
- Bug in :meth:`DataFrame.groupby` losing column name information when grouping by a categorical column (:issue:`28787`)
- Bug in :meth:`RollingGroupby.quantile` ignoring ``interpolation`` keyword argument (:issue:`28779`)
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i don’t think this will render, can u see how we reference rolling in other notes

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Sure, I'll find another example in the notes and imitate it.

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I changed the reference to DataFrameGroupBy.rolling().quantile(), similarly to the reference to DataFrameGroupBy.rolling().apply() here: https://pandas.pydata.org/pandas-docs/version/0.23.4/whatsnew.html#groupby-resample-rolling. Hopefully that will work better?


Reshaping
^^^^^^^^^
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4 changes: 3 additions & 1 deletion pandas/core/window/rolling.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1499,7 +1499,9 @@ def f(arg, *args, **kwargs):
interpolation,
)

return self._apply(f, "quantile", quantile=quantile, **kwargs)
return self._apply(
f, "quantile", quantile=quantile, interpolation=interpolation, **kwargs
)

_shared_docs[
"cov"
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15 changes: 8 additions & 7 deletions pandas/tests/window/test_grouper.py
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Expand Up @@ -59,7 +59,6 @@ def test_rolling(self):
r = g.rolling(window=4)

for f in ["sum", "mean", "min", "max", "count", "kurt", "skew"]:

result = getattr(r, f)()
expected = g.apply(lambda x: getattr(x.rolling(4), f)())
tm.assert_frame_equal(result, expected)
Expand All @@ -69,9 +68,10 @@ def test_rolling(self):
expected = g.apply(lambda x: getattr(x.rolling(4), f)(ddof=1))
tm.assert_frame_equal(result, expected)

result = r.quantile(0.5)
expected = g.apply(lambda x: x.rolling(4).quantile(0.5))
tm.assert_frame_equal(result, expected)
for f in ["linear", "lower", "higher", "midpoint", "nearest"]:
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Either here or in a follow up could you parametrize this test with these values rather than the loop within?

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can u make this a separate test and parmetrize

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Yes, I think I can handle that here - working on it now.

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@pwsiegel pwsiegel Nov 17, 2019 •
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I wrote a new test called test_rolling_quantile and parametrized the interpolation argument as requested, but unfortunately it looks as though most of the tests in this file have broken since I merged in master. To test, I checked out the upstream master branch, rebuilt my conda environment from scratch, and ran the tests there. 10 of the tests failed, including test_rolling (stack trace below). Is this a known issue?

self = <pandas.tests.window.test_grouper.TestGrouperGrouping object at 0x116432208>

    def test_rolling(self):
        g = self.frame.groupby("A")
        r = g.rolling(window=4)

        for f in ["sum", "mean", "min", "max", "count", "kurt", "skew"]:

>           result = getattr(r, f)()

test_grouper.py:64:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
../../core/window/rolling.py:1870: in sum
    return super().sum(*args, **kwargs)
../../core/window/rolling.py:1245: in sum
    return self._apply("roll_sum", "sum", **kwargs)
../../core/window/common.py:81: in _apply
    return self._groupby.apply(f)
../../core/groupby/groupby.py:718: in apply
    result = self._python_apply_general(f)
../../core/groupby/groupby.py:734: in _python_apply_general
    keys, values, mutated = self.grouper.apply(f, self._selected_obj, self.axis)
../../core/groupby/ops.py:171: in apply
    result_values, mutated = splitter.fast_apply(f, group_keys)
../../core/groupby/ops.py:904: in fast_apply
    return libreduction.apply_frame_axis0(sdata, f, names, starts, ends)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   AttributeError: 'Int64Index' object has no attribute '_has_complex_internals'

pandas/_libs/reduction.pyx:519: AttributeError

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Oops, @WillAyd's suggestion to rebuild the Cython extensions was correct. The tests are now passing; I'm going to push my changes shortly.

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The change is pushed - let me know if that's different from what you had in mind!

result = r.quantile(0.4, interpolation=f)
expected = g.apply(lambda x: x.rolling(4).quantile(0.4, interpolation=f))
tm.assert_frame_equal(result, expected)

def test_rolling_corr_cov(self):
g = self.frame.groupby("A")
Expand Down Expand Up @@ -141,9 +141,10 @@ def test_expanding(self):
expected = g.apply(lambda x: getattr(x.expanding(), f)(ddof=0))
tm.assert_frame_equal(result, expected)

result = r.quantile(0.5)
expected = g.apply(lambda x: x.expanding().quantile(0.5))
tm.assert_frame_equal(result, expected)
for f in ["linear", "lower", "higher", "midpoint", "nearest"]:
result = r.quantile(0.4, interpolation=f)
expected = g.apply(lambda x: x.expanding().quantile(0.4, interpolation=f))
tm.assert_frame_equal(result, expected)

def test_expanding_corr_cov(self):
g = self.frame.groupby("A")
Expand Down