In each final school nonresponse adjustment cell c, the school nonresponse adjustment factor SCH_NRAFc was computed as follows:
Sc is the set of all eligible sampled schools (cooperating original and substitute schools, and refusing original schools with noncooperating or no assigned substitute) in cell c,
Rc is the set of all cooperating schools within Sc,
SCH_BWTcs is the inverse of the school probability of selection,
SCH_TRIMs is the school-level weight trimming adjustment factor,
SCHSESWTs is the school-level session assignment weight, and
Xs is the estimated grade enrollment corresponding to the original sampled school.