A matrix of responses: persons as rows, items
  as columns, entries are either 0 or 1, no missing data

resp

Item parameters: a matrix with one row per
  item, and three columns: [,1] item discrimination
  $a$, [,2] item difficulty $b$, and [,3] asymptote
  $c$.

Computes the Z3 appropriateness index, a measure of
  person fit in IRT models

models

Provides a simple common interface to the estimation of
        item parameters in IRT models for binary responses with three
        different programs (ICL, BILOG-MG, and ltm, and a variety of
        functions useful with IRT models.

api: The Z3 appropriateness index

Description

Usage

Arguments

Value

References

Examples