“…Haines and Singpurwalla (1974) introduced the α-percentile residual life (α-PRL) function describing the α-percentile or quantile of the remaining life given survival up to a certain time. Afterwards, many authors studied this reliability measure in some details, e.g., Arnold and Brockett (1983), Gupta and Longford (1984), Joe and Proschan (1984), Joe (1985), Song and Cho (1995), Lin (2009), and Franco-Pereira et al (2010a, 2010b, 2010c, 2011. This measure and specially the median residual life function (0.5-PRL function) may be a good alternative for the MRL function particularly when the underlying distribution is skewed, the data are censored, we may have some outliers in the data set, or the statement for the MRL function is very complicated or infinite.…”