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
|
---|---|
Returns: | llf : float
|
Notes
llf = -1 / scale * \sum_i *(Y_i / \mu_i+ \log(\mu_i)+ (scale -1) * \log(Y) + \log(scale) + scale * \ln \Gamma(1 / scale))