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ddof no longer passed for Series.std and Series.var #934

dalejung opened this issue Mar 18, 2012 · 1 comment


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commented Mar 18, 2012

As part of the following commit:


Series.std and Series.var no longer pass along ddof to the nanops.nanvar function.

Also since ddof defaults to 1 in pandas and 0 in numpy.

arr = np.arange(10)
s = Series(arr)
# False
np.std(s) == np.std(arr)
# True
np.std(s) == np.std(arr, ddof=1)

Which I don't know if it's a bug but it's non-intuitive.


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commented Apr 2, 2012

fixed in PR #965 (will be part of pandas 0.7.3)

steveayers124 added a commit to steveayers124/pandas that referenced this issue Aug 18, 2019
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