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Importance Sampling of Test Cases in Markovian Software Usage Models

Published online by Cambridge University Press:  27 July 2009

Walter J. Gutjahr
Walter J. Gutjahr
Affiliation:
Department of Statistics, Operations Research and Computer Science, University of Vienna, Universitatsstrasse 5/9 A-1010 Vienna, Austria
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Abstract

Recently, some authors have suggested usage models of Markov type as a technique of specifying the estimated operational use distribution of a given program. A main purpose of such models is the derivation of random test cases allowing unbiased estimates on the (un)reliability of the program in its intended environment. In this article, we show that by a shift of the transition probabilities of the Markov chain corresponding to such a model, prior information on the errorjproneness of single-program operations can be taken into account. An unbiased unreliability estimator with reduced variance is obtained. Furthermore, it is shown that minimization of the variance leads to a special stochastic optimization problem that can be demonstrated to be convex, such that efficient solution techniques apply. Some related questions are also treated in a more general, non-Markovian framework.

Information

Type
Research Article
Information
Probability in the Engineering and Informational Sciences , Volume 11 , Issue 1 , January 1997 , pp. 19 - 36
Copyright
Copyright © Cambridge University Press 1997

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