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In this paper, we build a statistical test of aging on a given period, in the increasing failure rate (IFR) or decreasing failure rate (DFR) sense. More precisely, we build a nonparametric test for the null hypothesis that a cumulated hazard rate is convex (or concave) on a given interval, against the alternative that it is not. The observations are right-censored data, and the censoring variables...
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