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Reference.org
Systems simulation
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<p>Computers are used to generate numeric models for the purpose of describing or displaying complex interaction among multiple variables within a system. The complexity of the system arises from the <a href="/facts/Stochastic/uMbgL94r">stochastic</a> (probabilistic) nature of the events, rules for the interaction of the elements and the difficulty in perceiving the behavior of the systems as a whole with the passing of time. </p>