The api appropriateness index
Computes the api appropriateness index, a measure of person fit in IRT models
api(resp, ip, theta)
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 |
A vector of length equal to the number of rows in resp,
containing the appropriateness indices
Ivailo Partchev
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
api(Scored, Scored2pl)
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