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Issue No. 06 - November/December (2011 vol. 37)
ISSN: 0098-5589
pp: 872-877
Giulio Concas , University of Cagliari, Cagliari
Michele Marchesi , University of Cagliari, Cagliari
Alessandro Murgia , University of Cagliari, Cagliari
Roberto Tonelli , University of Cagliari, Cagliari
Ivana Turnu , University of Cagliari, Cagliari
The distribution of bugs in software systems has been shown to satisfy the Pareto principle, and typically shows a power-law tail when analyzed as a rank-frequency plot. In a recent paper, Zhang showed that the Weibull cumulative distribution is a very good fit for the Alberg diagram of bugs built with experimental data. In this paper, we further discuss the subject from a statistical perspective, using as case studies five versions of Eclipse, to show how log-normal, Double-Pareto, and Yule-Simon distributions may fit the bug distribution at least as well as the Weibull distribution. In particular, we show how some of these alternative distributions provide both a superior fit to empirical data and a theoretical motivation to be used for modeling the bug generation process. While our results have been obtained on Eclipse, we believe that these models, in particular the Yule-Simon one, can generalize to other software systems.
Software bug distribution, empirical research, object-oriented systems.

A. Murgia, I. Turnu, M. Marchesi, R. Tonelli and G. Concas, "On the Distribution of Bugs in the Eclipse System," in IEEE Transactions on Software Engineering, vol. 37, no. , pp. 872-877, 2011.
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