Expanding.std(ddof=1, numeric_only=False, engine=None, engine_kwargs=None)[source]#

Calculate the expanding standard deviation.

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.

New in version 1.5.0.

enginestr, default None
  • 'cython' : Runs the operation through C-extensions from cython.

  • 'numba' : Runs the operation through JIT compiled code from numba.

  • None : Defaults to 'cython' or globally setting compute.use_numba

    New in version 1.4.0.

engine_kwargsdict, default None
  • For 'cython' engine, there are no accepted engine_kwargs

  • For 'numba' engine, the engine can accept nopython, nogil and parallel dictionary keys. The values must either be True or False. The default engine_kwargs for the 'numba' engine is {'nopython': True, 'nogil': False, 'parallel': False}

    New in version 1.4.0.

Series or DataFrame

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

See also


Equivalent method for NumPy array.


Calling expanding with Series data.


Calling expanding with DataFrames.


Aggregating std for Series.


Aggregating std for DataFrame.


The default ddof of 1 used in Series.std() is different than the default ddof of 0 in numpy.std().

A minimum of one period is required for the rolling calculation.


>>> s = pd.Series([5, 5, 6, 7, 5, 5, 5])
>>> s.expanding(3).std()
0         NaN
1         NaN
2    0.577350
3    0.957427
4    0.894427
5    0.836660
6    0.786796
dtype: float64