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pandas.core.window.Expanding.mean

Expanding.mean(*args, **kwargs)[source]

Calculate the expanding mean of the values.

Parameters:
*args

Under Review.

**kwargs

Under Review.

Returns:
Series or DataFrame

Returned object type is determined by the caller of the expanding calculation.

See also

Series.expanding
Calling object with Series data.
DataFrame.expanding
Calling object with DataFrames.
Series.mean
Equivalent method for Series.
DataFrame.mean
Equivalent method for DataFrame.

Examples

The below examples will show rolling mean calculations with window sizes of two and three, respectively.

>>> s = pd.Series([1, 2, 3, 4])
>>> s.rolling(2).mean()
0    NaN
1    1.5
2    2.5
3    3.5
dtype: float64
>>> s.rolling(3).mean()
0    NaN
1    NaN
2    2.0
3    3.0
dtype: float64
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