Calculate unbiased expanding variance.

Normalized by N-1 by default. This can be changed using the ddof argument.

param ddof
int, default 1

Delta Degrees of Freedom. The divisor used in calculations is N - ddof, where N represents the number of elements. *args, **kwargs For NumPy compatibility. No additional arguments are used.


Series or DataFrame Returns the same object type as the caller of the expanding calculation.


This feature is currently unsupported by Intel Scalable Dataframe Compiler