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The table provided below contains links to Item Response Theory (IRT) parameters for NAEP science items that were scaled, as well as the block in which each item appears for each grade (Block) and the position of each item within its block (Item). Note that these item parameters are provided in the metrics used for the original calibration of the scales and thus are on a provisional scale.
| Year | Assessment | Earth Science Scale | Physical Science Scale | Life Science Scale |
|---|---|---|---|---|
| 2005 | Combined national and state main assessment grade 4 | R3 | R3 | R3 |
| Combined national and state main assessment grade 8 | R3 | R3 | R3 | |
| National main assessment grade 12 | R3 | R3 | R3 | |
| 2000 | National main assessment grade 4 | R3 / R2 | R3 / R2 | R3 / R2 |
| National main assessment grade 8 | R3 / R2 | R3 / R2 | R3 / R2 | |
| National main assessment grade 12 | R3 / R2 | R3 / R2 | R3 / R2 | |
| State assessment grade 4 | R3 / R2 | R3 / R2 | R3 / R2 | |
| State assessment grade 8 | R3 / R2 | R3 / R2 | R3 / R2 | |
| NOTE: R2 refers to accommodations not offered; R3 refers to accommodations offered to students with disabilities (SD) and English language learners (ELL) participating in the NAEP assessment. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 and 2005 Science Assessments. |
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