Description

It would be nice to provide StandardScaler with an option to chose unbiased estimator of variance,

It it sometimes convenient to use unbiased estimator of variance: numpy.var(X, ddof=1)
instead of default: numpy.var(X, ddof=0)

So far StandardScaler does not allow to set ddof.

Versions

Linux-4.4.0-45-generic-x86_64-with-Ubuntu-16.04-xenial
('Python', '2.7.12 (default, Jul 1 2016, 15:12:24) \n[GCC 5.4.0 20160609]')
('NumPy', '1.11.2')
('SciPy', '0.18.1')
('Scikit-Learn', '0.19.dev0')