Series.skew() for constant series returns inconsistent values · Issue #11974 · pandas-dev/pandas (original) (raw)

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Description

I'm not sure if this is a bug, but I'v noticed a strange behavior of skew() and kurt() on constant series:

#skew: pd.Series(3075.3, np.arange(300)).skew() #returns -105683727.49921818 pd.Series(3075.2, np.arange(300)).skew() #returns nan pd.Series(3075.5, np.arange(300)).skew() #returns 0

#kurt: pd.Series(3075.3, np.arange(300)).kurt() #returns 9305221026420888.0 pd.Series(3075.2, np.arange(300)).kurt() #returns -7459707710545691.0 pd.Series(3075.5, np.arange(300)).kurt() #returns 0

(using pandas 0.17.1 (from anacondas) on a 64bit intel windows 7 pc)