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Poisson Distribution

    The Poisson pdf is the probability of 𝑥 events occurring within a period, where 𝜆 is the expected number of events in that period.
    Probability Density Function (PDF)
      EXPFORECASTStep3
    Cumulative Distribution Function (CDF)
      EXPFORECASTStep3
    Support 𝑥 ∈ {1,2,3, ...}
    Event parameter, 𝜆: 𝑟 > 0, the mean of 𝑥

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