Based on this relationship, I estimate that changes in peers can explain roughly 9 percent of the impact on violent arrests in the middle school sample. (educationnext.org)
They had signed up 120 schools that teach pupils in sets, but found it impossible to find the much smaller school sample for mixed classes. (schoolsweek.co.uk)
We'll share updates as the timing for high school samples becomes clear. (openupresources.org)