api function

The api appropriateness index

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

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.

Returns

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

Examples

api(Scored, Scored2pl)

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

Author(s)

Ivailo Partchev