statsmodels.genmod.families.links.InverseSquared.inverse_deriv2¶

InverseSquared.inverse_deriv2(z)¶

Second derivative of the inverse of the power transform

Parameters:¶

zarray_like

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

Returns:¶

g^(-1)’(z)ndarray

The value of the derivative of the inverse of the power transform

function