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

Expanding.sem(ddof=1, numeric_only=False)[source]#

Calculate the expanding standard error of mean.

Parameters:

ddofint, default 1

Delta Degrees of Freedom. The divisor used in calculations is N - ddof, where N represents the number of elements.

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 one period is required for the calculation.

Examples

s = pd.Series([0, 1, 2, 3])

s.expanding().sem() 0 NaN 1 0.707107 2 0.707107 3 0.745356 dtype: float64