Table of Contents | Search Technical Documentation | References
NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters
NAEP Technical DocumentationScience Assessment IRT Parameters
The table links provided below contain Item Response Theory (IRT) parameters for NAEP science items that were scaled, as well as the block in which each item appeared for each grade and the position of each item within its block. Note that these item parameters are provided in the metrics used for the original calibration of the scales.
| Year | Assessment | Earth and space sciences scale | Physical science scale | Life science scale | Univariate science scale |
|---|---|---|---|---|---|
| 2019 | National assessment grade 4 | R3 | R3 | R3 | R3 |
| National assessment grade 8 | R3 | R3 | R3 | R3 | |
| National assessment grade 12 | R3 | R3 | R3 | R3 | |
| 2015 | Combined national and state assessments grade 4 | R3 | R3 | R3 | R3 |
| Combined national and state assessments grade 8 | R3 | R3 | R3 | R3 | |
| Combined national and state assessments grade 12 | R3 | R3 | R3 | R3 | |
| 2011 | Combined national and state assessments grade 8 | R3 | R3 | R3 | R3 |
| 2009 | Combined national and state assessments grade 4 | R3 | R3 | R3 | R3 |
| Combined national and state assessments grade 8 | R3 | R3 | R3 | R3 | |
| Combined national and state assessments grade 12 | R3 | R3 | R3 | R3 | |
| 2005 | Combined national and state assessments grade 4 | R3 | R3 | R3 | † |
| Combined national and state assessments grade 8 | R3 | R3 | R3 | † | |
| National assessment grade 12 | R3 | R3 | R3 | † | |
| 2000 | National assessment grade 4 | R3 / R2 | R3 / R2 | R3 / R2 | † |
| State assessment grade 4 | R3 / R2 | R3 / R2 | R3 / R2 | † | |
| National assessment grade 8 | R3 / R2 | R3 / R2 | R3 / R2 | † | |
| State assessment grade 8 | R3 / R2 | R3 / R2 | R3 / R2 | † | |
| National assessment grade 12 | R3 / R2 | R3 / R2 | R3 / R2 | † | |
| † Not applicable. There was no univariate science scale in 2000 or 2005. NOTE: R2 is the non-accommodated reporting sample; R3 is the accommodated reporting sample. If sampled students are classified as students with disabilities (SD) or English learners (EL), and school officials, using NAEP guidelines, determine that they can meaningfully participate in the NAEP assessment with accommodation, those students are included in the NAEP assessment with accommodation along with other sampled students including SD/EL students who do not need accommodations. The R3 sample is more inclusive than the R2 sample and excludes a smaller proportion of sampled students. The R3 sample is the only reporting sample used in NAEP after 2001. The block naming conventions used in the 2019 science assessment are described in the document 2019 Block Naming Conventions in Data Products and TDW. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), various years, 2000–2019 Science Assessments. | |||||
Last updated 05 October 2023 (SK)