statsmodels.genmod.families.links.Power.inverse_deriv2¶

Power.inverse_deriv2(z)[source]¶

Second derivative of the inverse of the power transform

Parameters:

z (array_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