The robust criterion function for Huber’s t.
z : array-like
1d array
array :
rho(z) = .5*z**2 for |z| <= t rho(z_ = |z|*t - .5*t**2 for |z| > t
scikits.statsmodels.robust.norms.HuberT.psi_deriv
scikits.statsmodels.robust.norms.HuberT.weights
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