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.
|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|