To what degree is absence (whether excused or unexcused) a measure of achievement?
To what degree does counting attendance in grading motivate students who are frequently absent?
I had one class where attendance was factored into my grade: 10th-grade U.S. History. Attendance may have an impact on student achievement, but then again, it may not. I have students who miss school frequently, but are so on top of their work that they still achieve at high levels.