stats
DescrStatsW.
std_ddof
standard deviation of data with given ddof
ddof : int, float
degrees of freedom correction, independent of attribute ddof
std : float, ndarray
standard deviation with denominator sum_weights - ddof
sum_weights - ddof
statsmodels.stats.weightstats.DescrStatsW.std
statsmodels.stats.weightstats.DescrStatsW.std_mean