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