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The stdev calculation is more accurate computing its own mean (#92220)

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Raymond Hettinger 2022-05-03 03:41:46 -05:00 • committed by GitHub
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commit ec8d3adb99
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Lib/statistics.py
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@ -1173,8 +1173,7 @@ class NormalDist:
"Make a normal distribution instance from sample data." "Make a normal distribution instance from sample data."
if not isinstance(data, (list, tuple)): if not isinstance(data, (list, tuple)):
data = list(data) data = list(data)
xbar = fmean(data) return cls(mean(data), stdev(data))
return cls(xbar, stdev(data, xbar))
def samples(self, n, *, seed=None): def samples(self, n, *, seed=None):
"Generate *n* samples for a given mean and standard deviation." "Generate *n* samples for a given mean and standard deviation."