Hampel weighting function for the IRLS algorithm
The psi function scaled by z
z : array-like
1d array
weights : array
weights(z) = 1 for |z| <= a weights(z) = a/|z| for a < |z| <= b weights(z) = a*(c - |z|)/(|z|*(c-b)) for b < |z| <= c weights(z) = 0 for |z| > c
weights(z) = 1 for |z| <= a
weights(z) = a/|z| for a < |z| <= b
weights(z) = a*(c - |z|)/(|z|*(c-b)) for b < |z| <= c
weights(z) = 0 for |z| > c
statsmodels.robust.norms.Hampel.rho
statsmodels.robust.norms.HuberT
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