api: The api appropriateness index

In irtoys: A Collection of Functions Related to Item Response Theory (IRT)

The api appropriateness index

Description

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

Usage

api(resp, ip, theta)

Arguments

resp	A matrix of responses: persons as rows, items as columns, entries are either 0 or 1, no missing data
ip	Item parameters: the object returned by est, or its first part.
theta	A measure of ability, typically produced with mlebme, wle etc. If missing, ML estimates will be computed automatically.

Value

A vector of length equal to the number of rows in resp, containing the appropriateness indices

Author(s)

Ivailo Partchev

References

Drasgow, F., Levine, M. V., & Williams, E. A. (1985). Appropriateness measurement with polychotomous item response models and standardized indices. British Journal of Mathematical and Statistical Psychology, 38, 67–80

Examples

api(Scored, Scored2pl)

irtoys documentation built on May 12, 2022, 5:06 p.m.