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The interpretation does not dependent on the package used; it does dependent on the underlying model and more specifically how close we are to the truncation point of $0$. Background: The Poisson probability function is $f(y_i;\mu_i| y_i \geq 0) = \frac{\mu^{y_i} e^{-\mu_i}}{y_i!}$ while we can transform it to a truncated Poisson by dividing its ...

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