statsmodels.genmod.families.links.Log.inverse_deriv2

Log.inverse_deriv2(z)

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

Parameters:

z (array_like) – z is usually the linear predictor for a GLM or GEE model.

Returns:

g’^(-1)(z) – The value of the second derivative of the inverse of the link function

Return type:

ndarray

Notes

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