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The Comprehensive Assessment Program is a new evaluation program for junior high school students started at year 2014 in Taiwan. As a part of the program, the scoring system on subject exams changes from hundred-mark system to letter grading system. Under such a huge alteration, it is expected to have a great impact on grades of all the examinees and the resulting PR ordering. This work aims to find out the influences on the grades due to changes of the grading systems. Some related issues are also discussed.
This thesis work consists of two parts. First, due to the limitation of available data, the distribution of the original scores for all subjects is inferred using statistical methods. In particular, the joint distribution of scores is assumed to follow multivariate normal distribution and the parameters are estimated by least squares and maximum likelihood methods. Given the distribution of scores, issues regarding the new system are discussed, compared to the former system. It turns out that the examinees with moderate ability are most affected on their PR rankings due to different systems. Moreover, the impact of subjects on PR is not consistent for different ability groups. For PR ranking, Chinese is generally an important subject among all ability groups, but Mathematics is most critical for examinees with moderate ability.
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