LSAT6: LSAT6 Data

In irtQ: Unidimensional Item Response Theory Modeling

LSAT6 Data

Description

A well-known dichotomous response dataset from the Law School Admission Test (LSAT), Section 6, as used in Thissen (1982).

Usage

LSAT6

Format

A data frame with 1,000 rows and 5 columns, where each row represents a unique examinee's response pattern to five dichotomously scored items (0 = incorrect, 1 = correct).

Author(s)

Hwanggyu Lim [e-mail]

References

Thissen, D. (1982). Marginal maximum likelihood estimation for the one-parameter logistic model. Psychometrika, 47, 175-186.

Examples

# structure of the data
head(LSAT6)

# fit the 2PL model to the LSAT6 data
est_irt(data = LSAT6, D = 1, model = "2PLM", cats = 2, verbose = FALSE)

irtQ documentation built on Oct. 5, 2026, 5:08 p.m.