statsmodels.genmod.families.links.CDFLink.inverse_deriv2

method

CDFLink.inverse_deriv2(z)

Second derivative of the inverse link function g^(-1)(z).

Parameters

zarray-like

z is usually the linear predictor for a GLM or GEE model.

Returns

g’^(-1)(z)array

The value of the second derivative of the inverse of the link function

Notes

This reference implementation gives the correct result but is inefficient, so it can be overriden in subclasses.