Oklahoma State University



Welcome to the OSU Department of Statistics


The Statistics Department at Oklahoma State University is the only statistics department in the state of Oklahoma.  The department offers courses in both undergraduate and graduate degree programs.  Our graduates are in demand in the areas of:  education, actuarial science, health care, agriculture research, marketing research, money and banking and many more disciplines.



OSU Department of Statistics

301 MSCS (Math Statistics and Computer Sciences)

Stillwater, OK  74078-1056


Office:  405-744-5684

FAX:  405-744-3533




Shuting (Tina) Shi

November 13, 2015

MSCS 310



Families of Life Distributions Based on Modified Residual Lifetimes


The power of Statistics is to make predictions and make the best decisions based on the current available information. Reliability and life testing focus on predictions on the ages of non-negative variables. The concepts of increasing and decreasing failure rates for univariate distributions have been found very useful in reliability. Other classes of distributions such as new better than used (NBU), new better than used in expectation (NBUE), and new better than used in convex ordering (NBUC) have also been extensively studied. The starshaped ordering of life distributions has been studied by Kayid, et al. (2011). This thesis focuses on the interrelationship between the widely used classes and classes based on the starshaped ordering. In addition to this, the widely used classes have been improved to describe the situations where some new better than used aging classes fail. The change of the variable itself or the environmental change on the variable have been considered. We introduce new better than improved used (NBIU), improved new better than used (INBU), improved new better than originally used (INBOU), and improved new better than improved used (INBIU) aging classes. We also calculate the moments in order to test exponentially against these classes.



Oklahoma Chapter of the American Statistical Association


The fall meeting of the Oklahoma Chapter of the American Statistical Association (OCASA) will be held on Friday, November 20th in Stillwater.  Professor Mwarumba Mwavita will speak on the interface between statisticians and the community.  The meeting will begin at 7:30pm in the Math Sciences Building, room 310.



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