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# scikits.statsmodels.robust.norms.AndrewWave.weights

`AndrewWave.``weights`(z)

  Andrew’s wave weighting function for the IRLS algorithm

  The psi function scaled by z

  Parameters: | z : array-like 1d array
  Returns: | array :

  Notes

  The weighting function for Andrews wave is defined as

      weights(z) = sin(z/a)/(z/a)     for |z| <= a*pi
      weights(z) = 0                  for |z| > a*pi

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