stats
statsmodels.stats.moment_helpers.
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.moment_helpers.corr2cov
statsmodels.stats.mediation.Mediation