statsmodels.genmod.families.links.InversePower.inverse_deriv2¶

InversePower.inverse_deriv2(z)¶

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