Ejigou Aynew (Professor)Zewotir Temesgen2018-06-282023-11-092018-06-282023-11-091991-11http://10.90.10.223:4000/handle/123456789/4451In this paper, the attrition rates of students from the period 1980/81 to 1989/1990, in the Faculty of Science of Addis Ababa University, were examined. We found that freshmen attrition rate linearly decrease over time. The dampening effect of the attrition rate as the students progress from semester to semester was assessed using two attrition models: the Guttman and Olkin (1989) model and a re parameterized model that we formulated. computer programs were prepared to obtain the maximum likelihood estimates for the underlying parameters in each model. consistent results were found in the two models; the progress of Students in consecutive semesters appeared to show a difference from batch to batchenAttrition RateThesis