“How Free is Free Education? The Impact of Tuition on Exam Marks” by Rachel Cole –

Other results of my exploratory analysis suggest what types of tuition are most helpful. Mass classes appear to be more helpful than group classes, and classes given in private tutories appear to be more helpful than those given in schools. Finally, for both subjects, the impact estimates by the number of weekly hours of tuition follow the same pattern: the lowest impact comes from attending more than six hours of tuition per week, a middling impact comes from attending less than three hours per week, and the highest impact comes from attending three to six hours per week.

via: http://groundviews.org/2015/03/03/how-free-is-free-education-the-impact-of-tuition-on-exam-marks/

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