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In page Monte Carlo method:

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Kalos and Whitlock[3] point out that such distinctions are not always easy to maintain. For example, the emission of radiation from atoms is a natural stochastic process. It can be simulated directly, or its average behavior can be described by stochastic equations that can themselves be solved using Monte Carlo methods. "Indeed, the same computer code can be viewed simultaneously as a 'natural simulation' or as a solution of the equations by natural sampling." Convergence of the Monte Carlo simulation can be checked with the Gelman-Rubin statistic.[citation needed]