154 def _sum(data):  argument
208 def _ss(data, c=None):  argument
414 def mean(data):  argument
436 def fmean(data, weights=None):  argument
474 def geometric_mean(data):  argument
493 def harmonic_mean(data, weights=None):  argument
549 def median(data):  argument
573 def median_low(data):  argument
595 def median_high(data):  argument
614 def median_grouped(data, interval=1.0):  argument
686 def mode(data):  argument
716 def multimode(data):  argument
773 def quantiles(data, *, n=4, method='exclusive'):  argument
822 def variance(data, xbar=None):  argument
866 def pvariance(data, mu=None):  argument
907 def stdev(data, xbar=None):  argument
925 def pstdev(data, mu=None):  argument
943 def _mean_stdev(data):  argument
1188     def from_samples(cls, data):  argument