Cortes, Kalena E.; Bricker, Jesse; Rohlfs, Chris - Institute for the Study of Labor (IZA) - 2010
Absences in Chicago Public High Schools are 3-7 days per year higher in first period than at other times of the day … class spills over into learning in other subjects. We find that having a class in first period reduces grades in that course … having a class in first period on test scores in that subject and in related subjects, particularly for math classes. …
