statsmodels.robust.norms.TukeyBiweight.rho¶
-
TukeyBiweight.
rho
(z)[source]¶ The robust criterion function for Tukey’s biweight estimator
- Parameters
- zarray_like
1d array
- Returns
- rho
ndarray
rho(z) = -(1 - (z/c)**2)**3 * c**2/6. for |z| <= R
rho(z) = 0 for |z| > R
- rho