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On a conjecture about the comparability of parallel systems with respect to the convex transform order

Arab Idir, Hadjikyriakou Milto, Oliveira Paulo Eduardo347

Probability and Mathematical Statistics

2021

Vol. 41, Fasc. 2

347--358

We study the comparability of the lifetimes of heterogeneous parallel systems with independent exponentially distributed components. It is known that the order statistics of systems composed of two types of components may be comparable with respect to the star transform order. On what concerns the stronger convex transform order, results have been obtained only for the sample maxima assuming that one of the systems is homogeneous. We prove, under the same assumptions as for the star transform ordering, that the lifetimes of heterogeneous parallel systems are not comparable with respect to the convex transform order.