Student assessibility is determined by two sets of administration rules denoted by sample type. Sample type S3 allows accommodations for certain students with special needs or disabilities to participate in the assessments, while sample type S2 does not allow these accommodations. As a result, a larger proportion of students is assessable in sample type S3 than in sample type S2.
The R2 reporting population is comprised of students who were not offered accommodations. Non-SD/LEP students from either sample type belong to the population, along with SD/LEP students from sample type S2.
The R3 reporting population includes accommodated students. Non-SD/LEP students from either sample type belong to the population, along with SD/LEP students from sample type S3.
Reporting populations may be described using the notation in the table below:
|Mathematics||4, 8, 12||A2 + A3 + B2||A2 + A3 + B3|
|Reading||4||A2 + A3 + B2||A2 + A3 + B3|
|Science||4, 8, 12||A2 + A3 + B2||A2 + A3 + B3|
|NOTE: "A" indicates assessed non-SD/LEP students; "B" indicates assessed SD/LEP students; and "2" or "3" indicates the sample type for which administration rules were used that did not allow accommodations (2) or did allow accommodations (3).
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000.