statsmodels.genmod.families.links.nbinom.deriv2¶
-
nbinom.
deriv2
(p)¶ Second derivative of the negative binomial link function.
- Parameters
p : array_like
Mean parameters
- Returns
g’’(p) : ndarray
The second derivative of the negative binomial transform link function
Notes
g’’(x) = -(1+2*alpha*x)/(x+alpha*x^2)^2