statsmodels.genmod.families.links.NegativeBinomial.deriv2¶

NegativeBinomial.deriv2(p)[source]¶

负二项式链接函数的二阶导数。

Parameters:¶

parray_like

均值参数

Returns:¶

g’’(p)ndarray

负二项变换链接函数的二阶导数

注释

g’’(x) = -(1+2*alpha*x)/(x+alpha*x^2)^2