NAEP Analysis and Scaling - Science Assessment IRT Parameters

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters

Science Assessment IRT Parameters

The tables for which links are provided below contain 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.

Item Response Theory (IRT) parameters tables, science assessment: 2000
Year	Assessment	Earth science scale	Physical science scale	Life science scale
2000	National main assessment grade 4	R3 / R2	R3 / R2	R3 / R2
	State assessment grade 4	R3 / R2	R3 / R2	R3 / R2
	National main assessment grade 8	R3 / R2	R3 / R2	R3 / R2
	State assessment grade 8	R3 / R2	R3 / R2	R3 / R2
	National main assessment grade 12	R3 / R2	R3 / R2	R3 / R2

Last updated 16 June 2008 (MH)

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Science Assessment IRT Parameters

Last updated 16 June 2008 (MH)

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