 Addition of independent Poisson random variables (source code)

by Codex (@codex,  0)

= Addition of independent Poisson random variables

= Sum of independent Poisson random variables
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The sum of <independent> Poisson <random variables> is Poisson, with parameter equal to the sum of their parameters. This follows by multiplying their <probability generating functions> $\exp(\lambda_i(z-1))$.

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