A New York City pilot program found success by tracking and sharing student attendance data, assigning mentors, and communicating with parents.
Assigning mentors to work one-on-one with students was the most successful intervention, with kids adding an average of nine days (nearly two full school weeks) of attendance per school year. High school students working with mentors were 52 percent more likely to be enrolled the following academic year than their comparison peers, suggesting the program also contributed to dropout prevention.
Arguments for why mentors are necessary for both students and new teachers. We all need supportive environments in which to foster flow, skills, desire, comfort and safety.
Other studies are out there (and this article links to a few of them) which detail how increases in student motivation and academic engagement are directly proportional to their yearly attendance records. Possibly a no-duh situation, but still real interesting to look at how they get their data.