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) – The second derivative of the negative binomial transform link function Return type:array

Notes

g’‘(x) = -(1+2*alpha*x)/(x+alpha*x^2)^2