The phrase "subgroup size" refers to the number of individuals or elements within a smaller group that is part of a larger group or population. Full definition
Many states have proposed a minimum subgroup size of 30 students to be included in calculations about adequate progress. (edweek.org)
Both NCLB and its successor, the Every Student Succeeds Act (ESSA), left the choice of minimum subgroup size at the school level (n - size) for accountability purposes to the states. (educationnext.org)
«Best Practices for Determining Subgroup Size in Accountability Systems While Protecting Personally Identifiable Student Information.» (educationnext.org)