EWM.std()
pandas.core.window.EWM.std
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EWM.std(bias=False, **kwargs)
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exponential weighted moving stddev
Parameters: bias : boolean, default False
Use a standard estimation bias correction
Returns: same type as input
See also
© 2011–2012 Lambda Foundry, Inc. and PyData Development Team
© 2008–2011 AQR Capital Management, LLC
© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.core.window.EWM.std.html