pandas.core.window.ewm.ExponentialMovingWindow.std — pandas 2.2.3 documentation (original) (raw)

ExponentialMovingWindow.std(bias=False, numeric_only=False)[source]#

Calculate the ewm (exponential weighted moment) standard deviation.

Parameters:

biasbool, default False

Use a standard estimation bias correction.

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.

Examples

ser = pd.Series([1, 2, 3, 4]) ser.ewm(alpha=.2).std() 0 NaN 1 0.707107 2 0.995893 3 1.277320 dtype: float64