The log-likelihood function in terms of the fitted mean response.
Parameters: | endog : array-like
mu : array-like
freq_weights : array-like
scale : float, optional
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Returns: | llf : float
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Notes
llf = scale * \sum_i freq\_weights_i * (Y_i * \log(\mu_i) - \mu_i - \ln \Gamma(Y_i + 1))