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Geography Assessment IRT Parameters

The tables for which links are provided below contain Item Response Theory (IRT) parameters for NAEP geography 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, geography assessment: 2001
Assessment Space and place scale Environment and society scale Spatial dynamics and connections scale
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

Last updated 20 November 2009 (GF)

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National Center for Education Statistics -
U.S. Department of Education