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