simCAT_MX: Simulated Mixed-Item Format CAT Data

In irtQ: Unidimensional Item Response Theory Modeling

Simulated Mixed-Item Format CAT Data

Description

A simulated dataset for computerized adaptive testing (CAT), containing an item pool, sparse response data, and examinee ability estimates. The item pool includes both dichotomous and polytomous items.

Usage

simCAT_MX

Format

A list of length three:

item_pool

A data frame in item metadata format consisting of 200 dichotomous items and 30 polytomous items.

• Dichotomous items: Calibrated using the IRT 3PL model.

• Polytomous items: Calibrated using the Generalized Partial Credit Model (GPCM), with three score categories (0, 1, 2).

response_data

A sparse matrix of item responses from 30,000 examinees.

theta_estimates

A numeric vector of ability estimates for the 30,000 examinees.

Author(s)

Hwanggyu Lim [e-mail]

irtQ documentation built on July 27, 2026, 9:08 a.m.