Attendance varies between courses, with the day of the week and with special events like exams and guest speakers.
Samuel Moulton, director of educational research and assessment for the Harvard Initiative for Learning and Teaching gave a presentation on their preliminary research on lecture attendance. He reported on attendance from 10 classes, and found that attendance varied depending upon day of the week:
He also saw that special events like an optional movie or a guest speaker had an impact on attendance:
How do these results compare to your experience? What factors contribute to attendance variation?
Watch Moulton's presentation: