Q_Ozaki: Q-Matrix from Ozaki (2015)

In NPCDTools: The Nonparametric Classification Methods for Cognitive Diagnosis

Q-Matrix from Ozaki (2015)

Description

A Q-matrix for 30 multiple-choice items measuring 5 attributes, originally used in Ozaki (2015) to demonstrate structured MC-DINA models. Items 1–10 are single-attribute items with no coded distractors. Items 11–20 have one coded distractor each, and items 21–30 have two or three coded distractors.

Usage

Q_Ozaki

Format

A data frame with 66 rows and 7 columns:

V1

Item index (1–30).

V2

Option index. For each item, the first row is the key; subsequent rows are coded distractors.

V3

Attribute 1 indicator (0 or 1).

V4

Attribute 2 indicator (0 or 1).

V5

Attribute 3 indicator (0 or 1).

V6

Attribute 4 indicator (0 or 1).

V7

Attribute 5 indicator (0 or 1).

References

Ozaki, K. (2015). DINA models for multiple-choice items with few parameters: Considering incorrect answers. Applied Psychological Measurement, 39, 431–447.

NPCDTools documentation built on Sept. 1, 2026, 1:08 a.m.