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# scikits.statsmodels.robust.norms.TrimmedMean.rho

`TrimmedMean.``rho`(z)

  The robust criterion function for least trimmed mean.

  Parameters: | z : array-like 1d array
  Returns: | array : rho(z) = (1/2.)*z**2 for |z| <= c rho(z) = 0 for |z| > c

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