simCAT_DC {irtQ}

Simulated single-item format CAT Data

Description

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

Usage

simCAT_DC

Format

This data includes a list of length three. The first internal object is a data.frame of the item pool consisting of 100 dichotomous items. The item parameters of the first 90 items were generated with the IRT 2PL model and calibrated with the same model. However, the item parameters of the last 10 items were generated with the IRT 3PL model but calibrated with the IRT 2PL model. The second internal object is the response data set including a sparse response data set of 10,000 examinees for the items in the item pool. The third internal object is the examinee's ability estimates for 10,000 examinees.

Author(s)

Hwanggyu Lim [e-mail]