PMID: 26793722Jan 23, 2016Paper

Investigation of outliers of evaluation scores among school of health instructors using outlier - determination indices

Journal of Advances in Medical Education & Professionalism
Hamidreza TabatabaeeMona Arvinfar

Abstract

Teacher evaluation, as an important strategy for improving the quality of education, has been considered by universities and leads to a better understanding of the strengths and weaknesses of education. Analysis of instructors' scores is one of the main fields of educational research. Since outliers affect analysis and interpretation of information processes both structurally and conceptually, understanding the methods of detecting outliers in collected data can be helpful for scholars, data analysts, and researchers. The present study aimed to present and compare the available techniques for detecting outliers. In this cross-sectional study, the statistical population included the evaluation forms of instructors completed by the students of Shiraz School of Health in the first and second semesters of the academic year 2012-2013. All the forms related to these years (N=1317) were entered into analysis through census. Then, four methods (Dixon, Gauss, Grubb, and Graphical methods) were used for determining outliers. Kappa coefficient was also used to determine the agreement among the methods. In this study 1317 forms were completed by 203 undergraduate and 1114 postgraduate students. The mean scores given by undergraduates and p...Continue Reading

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