statsmodels.genmod.families.links.NegativeBinomial.deriv¶

NegativeBinomial.deriv(p)[source]¶

Derivative of the negative binomial transform

Parameters:¶

parray_like

Mean parameters

Returns:¶

g’(p)ndarray

The derivative of the negative binomial transform link function

Notes

g’(x) = 1/(x+alpha*x^2)