Methods are developed for approximately characterizing the departure process from a single‐server queue and calculating approximate congestion measures for several single‐server queues in series. These methods are modifications of the previously described asymptotic method and stationary‐interval method for approximating a stochastic point process. The approximations are evaluated by comparing approximate congestion measures for queues in series with previous simulation results.
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Ward Whitt (1984) studied this question.
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