d deviation of the distribution.

Parameters
----------
arg1, arg2, arg3,... : array_like
    The shape parameter(s) for the distribution (see docstring of the
    instance object for more information)
loc : array_like, optional
    location parameter (default=0)
scale : array_like, optional
    scale parameter (default=1)

Returns
-------
std : float
    standard deviation of the distribution

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