The Impact of Study Groups and Roommates on Academic Performance
利用随机分配学生数据，发现室友间的非正式社交互动显著提升学业成绩，而学习小组无显著影响，且低能力学生从高能力同伴中受益。
This paper uses random assignment of students to investigate the impact of study groups and roommates on academic achievement. We find that informal social interaction with roommates has a significant positive impact on academic achievement, while study group peers have no discernible impact, a result driven by group heterogeneity in ability. We also find that lower-ability students benefit from high-ability students but not vice versa. © 2015 The President and Fellows of Harvard College and the Massachusetts Institute of Technology