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描述
The Conway-Maxwell-Poisson distribution (https://en.wikipedia.org/wiki/Conway%E2%80%93Maxwell%E2%80%93Poisson_distribution) is a generalization of the Poisson distribution that allows for both over- and underdispersion. There have been some attempts to get this distribution running in Stan, but I haven't seen one that works fast enough for most practical applications. Once we got such an implementation though, I think the distribution would make a very valuable addition to brms.