statsmodels.robust.norms.TukeyQuartic.weights

TukeyQuartic.weights(z)

TukeyQuartic weighting function for the IRLS algorithm

The psi function scaled by z.

Parameters:

zarray_like

1d array

Returns:

weightsndarray

weights(z) = (1 - (z/c)**k)**2 for |z| <= c

weights(z) = 0 for |z| > c