​NAEP Technical DocumentationSchool and Student Participation in the 2019 State Assessment

The tables linked present weighted school and student participation rates and weighted student exclusion rates for the fourth- and eighth-grade public school state assessment samples.

A weighted school participation rate indicates the percentage of the student population that is directly represented by the participating school sample.

A weighted student participation rate indicates the percentage of the student population that is directly represented by the assessed students from within participating schools.

A weighted exclusion rate indicates the percentage of students in the population that would be excluded from the assessment. Students are generally excluded from a NAEP assessment if they have a disability or limited English language proficiency that prevents them from taking the assessment altogether or the accommodations they require to take the assessment were unavailable.

Weighted school participation rates are calculated by dividing the sum of school base weights, weighted by student enrollment of the targeted grade, for all participating schools by the sum of the base weights, weighted by student enrollment of the target grade, for all eligible schools. Eligible schools are all sampled schools except those considered out-of-scope. The base weight is assigned to all sampled schools and is the inverse of the probability of selection. The weighted school participation rates in these tables reflect participation prior to substitution. That is, participating substitute schools that took the place of refusing originally sampled schools are not included in the numerator.

Weighted student participation rates are calculated by dividing the sum of the student base weights for all assessed students by the sum of the student base weights for all assessable students. (See below for the response dispositions of NAEP sampled students.) Students deemed assessable are those who were assessed or absent. They do not include students that were not eligible (primarily made up of withdrawn or graduated students) or students with disabilities (SD) or English ​learners (EL) students who were excluded from the assessment.

Weighted student exclusion rates are calculated by dividing the sum of the school nonresponse-adjusted student base weights for all excluded students by the sum for all assessable and excluded students.

Every student sampled for NAEP is classified into one of the following response disposition categories:

1. Assessed
2. Absent
3. Excluded (must be SD students, EL students, or SD and EL students)
4. Withdrawn or Graduated (ineligible)

Assessed students were students that completed an assessment.

Absent students were students who were eligible to take an assessment but were absent from the initial session and the makeup session if one was offered. (Note, some schools, not all, had make-up sessions for students who were absent from the initial session.)

Excluded students were determined by their school to be unable to meaningfully take the NAEP assessment in their assigned subject, even with an accommodation. Excluded students must also be classified as SD and/or EL.

Withdrawn or graduated students are those who have left the school before the original assessment. These students are considered ineligible for NAEP.

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