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# scikits.statsmodels.robust.norms.HuberT.rho

`HuberT.``rho`(z)

  The robust criterion function for Huber’s t.

  Parameters: | z : array-like 1d array
  Returns: | array : rho(z) = .5*z**2 for |z| <= t rho(z_ = |z|*t - .5*t**2 for |z| > t

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