(Received July 1, 1996; revised October 13, 1997)
Abstract. In this paper, we propose a non-Gaussion state space model to apply in software reliability. This model assumes an exponential distribution for the failure time in every test-debugging stage, conditionally on the state parameter---the number of faults in the program. It is a generalized JM model which can be applied to the imperfect debugging situation as well as in evolving programs. By examining a set of data on evolving program failures, the effect of evolving program model is amply proved.
Key words and phrases: JM model, linear exponential loss function, Poisson distribution, exponential distribution.
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