pandas.core.window.expanding.Expanding.skew — pandas 2.2.3 documentation (original) (raw)

Expanding.skew(numeric_only=False)[source]#

Calculate the expanding unbiased skewness.

Parameters:

numeric_onlybool, default False

Include only float, int, boolean columns.

Added in version 1.5.0.

Returns:

Series or DataFrame

Return type is the same as the original object with np.float64 dtype.

Notes

A minimum of three periods is required for the rolling calculation.

Examples

ser = pd.Series([-1, 0, 2, -1, 2], index=['a', 'b', 'c', 'd', 'e']) ser.expanding().skew() a NaN b NaN c 0.935220 d 1.414214 e 0.315356 dtype: float64