statsmodels.genmod.families.links.Link.inverse_deriv2¶
-
Link.inverse_deriv2(z)[source]¶ Second derivative of the inverse link function g^(-1)(z).
- Parameters
- zarray_like
z is usually the linear predictor for a GLM or GEE model.
- Returns
- g’^(-1)(z)
ndarray The value of the second derivative of the inverse of the link function
- g’^(-1)(z)
Notes
This reference implementation gives the correct result but is inefficient, so it can be overridden in subclasses.