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Science Assessment Item Response Theory Parameters

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.

Links to science item response theory (IRT) parameters tables, by year:  Various years, 2000–2011
Year Assessment Earth and space
sciences scale
Physical
science scale
Life
science scale
Univariate
science scale
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.
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), various years, 2000–2011 Science Assessments.

Last updated 14 March 2016 (GF)