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