On testing More IFRA Ordering-II

Abstract: Suppose F and G are two life distribution functions. It is said that F is more IFRA than G (written by F<* G) if G^-1 F(x) is starshaped on (0,infty). In this paper, the problem of testing H_0:F=* G against H_1:F<* G and F \neq* G is considered in both cases when G is known and when G is unknown. We propose a new test based on U-statistics and obtain the asymptotic distribution of the test statistics. The new test is compared with some well known tests in the literature. In addition, we apply our test to a real data set in the context of reliability.