Abstract
Online education has gained great attention in recent years. MOOCs allow people to take courses with no limits on time and geographic locations. But with the rapid development of online education, few people put emphasis on the quality of online education. More people concentrate on the spreading and expansion. There is still much to study and talk about. The paper builds a distributed data warehouse and analyzes the course data from Coursera. It measures the real quality and effects of online education in country distribution, homework completion, grading policy and peer assessments. The paper introduces a new grading policy for peer assessment and talks about the current problems and the future development of MOOCs.
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