Interval coverage in multiclass queues using batch mean estimates

Article Abstract:

The performance of the fixed, sample-size, batch-mean procedure for creating confidence intervals in multiclass queueing systems is examined. It is found that serial correlation between customers of the same class, for a multiclass M/M/1, drops to zero with the growth in the number of customer classes. The batch-mean estimator coverage for a simple queue with multiple customer classes is tested empirically. It is hypothesized that monoclass systems are inferior to confidence interval coverage for batch-mean estimates in multiclass M/M/1 queues with a fixed number of observations per class. Evidence supporting this proposition is generated by a series of simulation experiments on the M/M/1 for different traffic intensities, run lengths and batch sizes.

Analysis, Queuing theory, Confidence intervals, Limit theorems (Probability theory)

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The extraordinary activist

Article Abstract:

Musician and animal advocate Paul McCartney describes his life with his wife Linda, their environmental activism and his views on animal issues. He says that he prefers doing interviews as a way of promoting Linda's album and animal issues.

Interview, McCartney, Paul, Musicians

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Capsized!

Article Abstract:

Isabelle Autissier and her experiences in the solo boat race Around Alone 1998-99 are described. Autissier's 60-foot yacht capsized in a remote part of the Southern Ocean and was rescued by a fellow racer Italian Giovanni Soldini.

Behavior, Competitions, Sailing, Single-handed, Single handed sailing, Autissier, Isabelle

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