Software reliability models with time-dependent hazard function based on Bayesian approach

In this paper, two models predicting mean time until next failure based on Bayesian approach are presented. Times between failures follow Weibull dist ributions with stochastically decreasing ordering on the hazard functions o f successive failure time intervals, reflecting the tester's intent to impr ove the software quality with each corrective action. We apply the proposed models to actual software failure data and show they give better results u nder sum of square errors criteria as compared to previous Bayesian models and other existing times between failures models, Finally, we utilize likel ihood ratios criterion to compare new models predictive performance.