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In ModelAssist we use the product λ*t as the parameter for the Poisson distribution, because it makes Poisson modeling much easier. Two examples of the Poisson distribution are shown below, with λt equal to 5 and 23 respectively:

    1. ModelAssist
    2.  Dashboard


  1.  Discrete distributions
  2.  Poisson


The Poisson(λt) distribution models the number of occurrences of an event in a time t with an expected rate of  l events per period t when the time between successive events follows a Poisson process (we suggest that you read the section on the Poisson process first, before continuing here).