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Toward the evaluation of P(X(t) > Y(t)) when both X(t) and Y(t) are inactivity times of two systems
Authors:T. H. M. Abouelmagd  M. S. Hamed  Abd El Hadi N. Ebraheim  Ahmed Z. Afify
Affiliation:1. Management Information System Department, Taibah University, Medina, Saudi Arabia;2. Department of Statistics, Mathematics and Insurance, Benha University, Banha, Egypttabouelmagd@taibahu.edu.sa;4. Department of Statistics, Mathematics and Insurance, Benha University, Banha, Egypt;5. Institute of Statistical Studies and Research, Cairo University, Cairo, Egypt;6. Department of Statistics, Mathematics and Insurance, Benha University, Banha, Egypt
Abstract:
The inactivity time, also known as reversed residual life, has been a topic of increasing interest in the literature. In this investigation, based on the comparison of inactivity times of two devices, we introduce and study a new estimate of the probability of the inactivity time of one device exceeding that of another device. The problem studied in this paper is important for engineers and system designers. It would enable them to compare the inactivity times of the products and, hence to design better products. Several properties of this probability are established. Connections between the target probability and the reversed hazard rates of the two devices are established. In addition, some of the reliability properties of the new concept are investigated extending the well-known probability ordering. Finally, to illustrate the introduced concepts, many examples and applications in the context of reliability theory are included.
Keywords:Bias sampling  mean inactivity time  reliability  reliability ordering  reversed hazard rate  U-statistics
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