stats
statsmodels.stats.sandwich_covariance.
se_cov
get standard deviation from covariance matrix
just a shorthand function np.sqrt(np.diag(cov))
cov : array_like, square
covariance matrix
std : ndarray
standard deviation from diagonal of cov
statsmodels.stats.sandwich_covariance.cov_hc3
statsmodels.stats.gof.powerdiscrepancy