Considering Fið:Þ as the probability distribution of the system failures inter-arrival times iT (i ¼ 1, 2, 3, . . .) (Figure 1), Wang and Pham (1996, 1997) expressed the quasi-renewal function as follows
Considering Fið:Þ as the probability distribution of the system failures inter-arrival times iT (i ¼ 1, 2, 3, . . .)(Figure 1), Wang and Pham (1996, 1997) expressed the quasi-renewal function as follows