Weighted Estimators for the Survival and Cumulative Hazard Functions of Quality Adjusted Lifetime رسالة ماجستير

Abstract

The survival function of restricted quality adjusted lifetime (RQAL) has become more important in studies nowadays than survival function of overall lifetime. The reason is due to the fact that the researcher needs real-time for the observations under the conditions of his or her life. In this work we will estimate e cient estimators for the survival function of restricted quality adjusted lifetime if the data has left and right censorship. Also, we derived a class of estimators for the cumulative hazard function based on estimations of the survival function of (RQAL). Simulation study using R-programming has been conducted to compare the e ciency of the estimators of the true survival function.