pandas.core.window.Expanding.cov

Expanding.cov(self, other=None, pairwise=None, ddof=1, **kwargs)

Calculate the expanding sample covariance.

Parameters:

other : Series, DataFrame, or ndarray, optional

If not supplied then will default to self and produce pairwise output.

pairwise : bool, default None

If False then only matching columns between self and other will be used and the output will be a DataFrame. If True then all pairwise combinations will be calculated and the output will be a MultiIndexed DataFrame in the case of DataFrame inputs. In the case of missing elements, only complete pairwise observations will be used.

ddof : int, default 1

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

**kwargs

Keyword arguments to be passed into func.

Returns:

Series or DataFrame

Return type is determined by the caller.

See also

Series.expanding

Series expanding.

DataFrame.expanding

DataFrame expanding.