statsmodels.robust.norms.TukeyBiweight.weights
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TukeyBiweight.weights(z)
[source] -
Tukey?s biweight weighting function for the IRLS algorithm
The psi function scaled by z
Parameters: z : array-like
1d array
Returns: weights : array
psi(z) = (1 - (z/c)**2)**2 for |z| <= R
psi(z) = 0 for |z| > R
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