基于点击流数据和社交学习网络的MOOC性能预测

Christopher G. Brinton, M. Chiang
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引用次数: 145

摘要

我们研究了大规模开放在线课程(MOOCs)中的学生成绩预测,其目标是预测用户在第一次尝试(CFA)中是否正确回答问题。在此过程中,我们开发了利用MOOC平台收集的行为数据的新技术。使用来自mooc的视频观看点击流数据,我们首先提取每个用户视频对的汇总数量(例如,播放的分数,暂停的次数),并显示这些行为的特定间隔/值集如何量化一对更有可能获得CFA或不获得相应问题的CFA。受这些发现的启发,我们的方法旨在从训练数据中确定合适的间隔,并使用相应的成功估计作为预测算法中的学习特征。通过对大量经验数据的测试,我们发现我们的方案在所有测试的数据集和指标上都优于标准算法(即,没有行为数据)。此外,考虑到课程的前几周,这种改进尤其明显,这证明了这种点击流数据的“早期检测”能力。我们还讨论了如何使用CFA预测来描绘学生的社会学习网络(SLN)的图形,这可以帮助教师更有效地管理课程。
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MOOC performance prediction via clickstream data and social learning networks
We study student performance prediction in Massive Open Online Courses (MOOCs), where the objective is to predict whether a user will be Correct on First Attempt (CFA) in answering a question. In doing so, we develop novel techniques that leverage behavioral data collected by MOOC platforms. Using video-watching clickstream data from one of our MOOCs, we first extract summary quantities (e.g., fraction played, number of pauses) for each user-video pair, and show how certain intervals/sets of values for these behaviors quantify that a pair is more likely to be CFA or not for the corresponding question. Motivated by these findings, our methods are designed to determine suitable intervals from training data and to use the corresponding success estimates as learning features in prediction algorithms. Tested against a large set of empirical data, we find that our schemes outperform standard algorithms (i.e., without behavioral data) for all datasets and metrics tested. Moreover, the improvement is particularly pronounced when considering the first few course weeks, demonstrating the “early detection” capability of such clickstream data. We also discuss how CFA prediction can be used to depict graphs of the Social Learning Network (SLN) of students, which can help instructors manage courses more effectively.
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