simCAT_MX {irtQ}

Simulated mixed-item format CAT Data

Description

This data set contains an item pool information, response data, and examinee's ability estimates.

Usage

simCAT_MX

Format

This data includes a list of length three. The first internal object is a data.frame of the item pool consisting of 200 dichotomous items and 30 polytomous items. The dichotomous items were calibrated with the IRT 3PL model and the polytomous items were calibrated with the generalized partial credit model. All polytomous items have three score categories (i.e., 0, 1, 2). The second internal object is the response data set including a sparse response data set of 30,000 examinees for the items in the item pool. The third internal object is the examinee's ability estimates for 30,000 examinees.

Author(s)

Hwanggyu Lim [e-mail]