statsmodels.genmod.families.links.NegativeBinomial¶
- class statsmodels.genmod.families.links.NegativeBinomial(alpha=1.0)[source]¶
The negative binomial link function
- Parameters:
- alpha
float
,optional
Alpha is the ancillary parameter of the Negative Binomial link function. It is assumed to be nonstochastic. The default value is 1. Permissible values are usually assumed to be in (.01, 2).
- alpha
Methods
__call__
(p)Negative Binomial transform link function
Methods
deriv
(p)Derivative of the negative binomial transform
deriv2
(p)Second derivative of the negative binomial link function.
inverse
(z)Inverse of the negative binomial transform
Derivative of the inverse of the negative binomial transform
Second derivative of the inverse link function g^(-1)(z).