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政大機構典藏 > 資訊學院 > 資訊科學系 > 會議論文 > Item 140.119/39726

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/39726

Title:	Exploring Effect of Rater on Prediction Error in Automatic Text Grading for Open-ended Question
Authors:	李蔡彥 Li,Tsai-Yen
Contributors:	國立政治大學資訊科學系
Keywords:	Rater;prediction error;SVM;automatic grader;testing;science learning
Date:	2009-11
Issue Date:	2010-05-27 16:49:20 (UTC+8)
Abstract:	This paper aims to explore the way of evaluating the automatic text grader for open-ended questions by considering the relationships among raters, grade levels, and prediction errors. The open-ended question in this study was about aurora and required knowledge of earth science and physics. Each student’s response was graded from 0 to 10 points by three raters. The automatic grading systems were designed as support-vectormachine regression models with linear, quadratic, and RBF kernel respectively. The three kinds of regression models were separately trained through grades by three human raters and the average grades. The preliminary evaluation with 391 students’ data shows results as the following: (1) The higher the grade-level is, the larger the prediction error is. (2) The ranks of prediction errors of human-rater-trained models at three grade levels are different. (3) The model trained through the average grades has the best performance at all three grade-levels no matter what the kind of kernel is. These results suggest that examining the prediction errors of models in detail on different grade-levels is worthwhile for finding the best matching between raters’ grades and models.
Relation:	Proceedings of the 17th International Conference on Computers in Education
Data Type:	conference
Appears in Collections:	[資訊科學系] 會議論文

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