This class holds the distribution family with the log-likelihood functions and the first two derivatives, the gradient vector and the Hessian matrix. It is not meant to be used directly, but rather for development convenience.
The log-likelihood function. Gives a scalar
The first derivative of the log-likelihood functions. Gives a vector.
An integer indicating the family. Negative Binomial = 1, Quasi-Binomial = 2.
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