statsmodels.robust.norms.TukeyBiweight.rho¶

TukeyBiweight.rho(z)[source]¶

Tukey双权重估计器的鲁棒准则函数

Parameters:¶

zarray_like

一维数组

Returns:¶

rhondarray

rho(z) = -(1 - (z/c)**2)**3 * c**2/6. 对于 |z| <= R

rho(z) = 0 对于 |z| > R