pandas.expanding_std¶
-
pandas.
expanding_std
(arg, min_periods=1, freq=None, **kwargs)¶ Expanding standard deviation.
Parameters: arg : Series, DataFrame
min_periods : int, default None
Minimum number of observations in window required to have a value (otherwise result is NA).
freq : string or DateOffset object, optional (default None)
Frequency to conform the data to before computing the statistic. Specified as a frequency string or DateOffset object.
ddof : int, default 1
Delta Degrees of Freedom. The divisor used in calculations is
N - ddof
, whereN
represents the number of elements.Returns: y : type of input argument