statsmodels.robust.norms.TukeyBiweight.rho
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TukeyBiweight.rho(z)
[source] -
The robust criterion function for Tukey?s biweight estimator
Parameters: z : array-like
1d array
Returns: rho : array
rho(z) = -(1 - (z/c)**2)**3 * c**2/6. for |z| <= R
rho(z) = 0 for |z| > R
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