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###### using non-robust (ordinary) variance covariance matrix, percentile method #####
### note the robust variance covariance matrix could be estimated by https://scikit-learn.org/stable/modules/covariance.html#robust-covariance-estimation ###
### you just need simply replace V by calling scikit-learn package ###
#### data is N by P matrix where N is the number of observations, and the P is the number of dimensions ###