Correction to u22Stochastic comparisons of parallel systems when components have proportional hazard ratesu22

摘要

In the article u22Stochastic comparisons of parallel systems when component have proportional hazard ratesu22 we found a gap in the middle of the proof of Theorem 3.2. Therefore, we do not know whether Theorem 3.2 is true for the reverse hazard rate order. However, we could prove the following weaker result for the stochastic order.