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Published online by Cambridge University Press: 11 August 2014
Given any probability distribution, new distributions can be derived from it by assuming its parameters to follow some specific probability distributions. A simple example of this process is provided by the Poisson distribution
P(r∣λ) = e-λλr/r! (r = o, 1, 2, …).
If the parameter λ is assumed to follow the Pearson's Type III law
then the probability of r successes is obtained as