pandas.core.groupby.DataFrameGroupBy.cov¶
- DataFrameGroupBy.cov(min_periods=None)¶
Compute pairwise covariance of columns, excluding NA/null values
Parameters : min_periods : int, optional
Minimum number of observations required per pair of columns to have a valid result.
Returns : y : DataFrame
Notes
y contains the covariance matrix of the DataFrame’s time series. The covariance is normalized by N-1 (unbiased estimator).