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BUG: <code>Rolling.skew</code> and <code>Rolling.kurt</code> return NaN for low-variance windows

Bug

Numeric stabilityStability and precisionStability and precision

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#62946 In pandas-dev/pandas;

· Alvaro-Kothe opened on Nov 1, 2025

BUG: rolling().corr() crash with time period

Bug

SegfaultNon-Recoverable ErrorNon-Recoverable Error

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#62937 In pandas-dev/pandas;

· kostayScr opened on Oct 31, 2025

BUG: Wrong skewness and kurtosis for degenerate distributions

Bug

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#62864 In pandas-dev/pandas;

· Alvaro-Kothe opened on Oct 26, 2025

BUG: incorrect <code>cumsum</code> results for pyarrow on windows

Bug

Windowrolling, ewma, expandingrolling, ewma, expanding

WindowsWindows OSWindows OS

Status: Open.

#62477 In pandas-dev/pandas;

· MarcoGorelli opened on Sep 27, 2025

Incorrect rolling std() results on very large DataFrames

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#61677 In pandas-dev/pandas;

· ZuotaoZhang opened on Jun 18, 2025

raise TypeError when function returns object-like results

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#61529 In pandas-dev/pandas;

· michael2015tse opened on Jun 1, 2025

ENH: access sliced dataframe from rolling.cov

Enhancement

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#61401 In pandas-dev/pandas;

· srkunze opened on May 6, 2025

BUG(?): rolling sum with pyarrow types results in float64 instead of preserving integer type

Arrowpyarrow functionalitypyarrow functionality

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#61144 In pandas-dev/pandas;

· MarcoGorelli opened on Mar 18, 2025

BUG: inconsistent indices in <code>GroupByRolling</code> when selecting or not selecting subset of columns

API - ConsistencyInternal Consistency of API/BehaviorInternal Consistency of API/Behavior

Bug

Groupby

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#59567 In pandas-dev/pandas;

· inigohidalgo opened on Aug 20, 2024

BUG: numerical inconsistency in calculating rolling kurtosis

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#58711 In pandas-dev/pandas;

· HaloCollider opened on May 14, 2024

BUG: ewm with adjust=False and ignore_na=False does not properly take NaNs into account

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#58538 In pandas-dev/pandas;

· btglau opened on May 2, 2024

REGR?: ExponentialMovingWindow.aggregate raises on main with np.mean

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#58299 In pandas-dev/pandas;

· twoertwein opened on Apr 17, 2024