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OF THE THESIS NEW BIVARIATE LIFETIME DISTRIBUTIONS BASED ON BATH-TUB SHAPED FAILURE RATE by Mengying Li Florida International University, 2014 Miami, Florida Professor Hassan Zahedi, Major Professor A class of lifetime distributions which has received considerable attention in modelling and analysis of lifetime data is the class of lifetime distributions with bath-tub shaped failure rate functions because of their extensive applications. The purpose of this thesis was to introduce a new class of bivariate lifetime distributions with bath-tub shaped failure rates (BTFRFs). In this research, first we reviewed univariate lifetime distributions with bath-tub shaped failure rates, and several multivariate extensions of a univariate failure rate function. Then we introduced a new class of bivariate distributions with bath-tub shaped failure rates (hazard gradients). Specifically, the new class of bivariate lifetime distributions were developed using the method of Morgensterns method of defining bivariate class of distributions with given marginals. The computer simulations and numerical computations were used to investigate the properties of these distributions.

New Bivariate Lifetime Distributions Based on Bath-Tub Shaped Failure Rate