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Likelihood Function of a Debugging Model for Computer Software Reliability

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2 Author(s)
Littlewood, Bev ; City University, London; Dept. of Operations Research; School of Engineering and Applied Science; The George Washington University; Washington, DC 20052 USA. ; Verrall, John L.

A simple model for software reliability growth, originally suggested by Jelinski & Moranda, has been widely used but suffers from difficulties associated with parameter estimation. We show that a major reason for obtaining nonsensical results from the model is its application to data sets which exhibit decreasing reliability. We present a simple, necessary and sufficient condition for the maximum likelihood estimates to be finite and suggest that this condition be tested prior to using the model.

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Reliability, IEEE Transactions on  (Volume:R-30 ,  Issue: 2 )