statsmodels.robust.norms.TukeyBiweight.weights¶

TukeyBiweight.weights(z)[source]¶

用于IRLS算法的Tukey双权重函数

psi 函数按 z 缩放

Parameters:¶

zarray_like

一维数组

Returns:¶

weightsndarray

psi(z) = (1 - (z/c)**2)**2 对于 |z| <= R

psi(z) = 0 对于 |z| > R