statsmodels.genmod.families.links.inverse_power.inverse_deriv2¶
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inverse_power.
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