But during that period, there was substantial year - to - year variation in the number of instructional days students had prior to the test date. (educationnext.org)
Students with special needs showed learning gains equivalent to nine additional instructional days in math and 13 in reading. (k12education.gatesfoundation.org)
While our studies use data from different states and years, and employ somewhat different statistical methods, they yield very similar results on the value of additional instructional days for student performance. (educationnext.org)