Description

The NAEPirtparams package provides NAEP IRT parameters, item adjustment information, and subtest transformation information for NAEP assessments.

Details

The package provides a table called parameters, which has item parameters by year, subject, and grade. The adjustments table provides the item adjustment information that NAEP implemented in scaling (i.e., item deletions and collapsed score categories). The table transformations has the location, scale, and weights for the subtests that make up a test.