statsmodels.genmod.families.links.CDFLink.inverse_deriv2¶

CDFLink.inverse_deriv2(z)[source]¶

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 method should be overwritten by subclasses.

The inherited method is implemented through numerical differentiation.