Pandas: why pandas.Series.std() is quite different from numpy.std()
I got two snippets code as follows.

> > numpy.std([766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346])
> > 
> > 0
> > 
> > pd.Series([766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346, 766897346]).std(ddof=0)
> > 
> > 10.119288512538814

The two lists are identical but the result are quite different. I think the pandas' result must be wrong. I work on the latest version 0.16.2 with Python 3.4.

May I ask why? Is it a bug?
