The final or full-sample student weight is the sampling weight used to derive student estimates of population and subpopulation characteristics for the specified assessment type (operational or bridge), subject (reading or mathematics), and age (9, 13, or 17). The full-sample student weight reflects the number of students that the sampled student represents in the population for purposes of estimation. The summation of the final student weights over a particular subgroup provides an estimate of the total number of students in that subgroup in the population.
The full-sample weight, which is used to produce survey estimates, is distinct from a replicate weight, which is used to estimate the variance of student estimates. The full-sample weight is assigned to participating students and reflects the student base weight after the application of the various weighting adjustments for school and student nonresponse, and school and student trimming. The final student weight for student k from school s in jurisdiction j (FSTUWGTjsk) can be expressed as follows:
STU_BWTjsk is the student base weight,
SCH_NRAFjs is the school-level nonresponse adjustment factor,
STU_NRAFjk is the student-level nonresponse adjustment factor,
SCH_TRIMjs is the school-level weight trimming adjustment factor, and
STU_TRIMjk is the student-level weight trimming adjustment factor.
The student adjustment factor does not include a subscript s to reflect the fact that not every student in school s falls into the same student nonresponse cell or the same training group.