Previous research and firsthand experience for most of us verify that attendance in class improves performance. Many of our students would still like to believe otherwise, but the positive relationship between attendance and performance reported in the research is robust and long-standing.
In a good example of research that goes beyond replicating what is well established, a group of business faculty members explored the attendance-performance connection in a more nuanced way. They studied the effects of a compulsory attendance policy on absenteeism and grades, as others have, but they looked specifically at the relationship for high- and low-achieving students.