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. 2025 Mar:103:28-29.
doi: 10.1016/j.annepidem.2025.01.012. Epub 2025 Feb 10.

Youden index and Tjur's R2 in 2 × 2 tables

Linard Hoessly  1
Affiliations

Youden index and Tjur's R2 in 2 × 2 tables

Linard Hoessly. Ann Epidemiol. 2025 Mar.

Abstract

We refer to a recent paper by Hughes and show that despite similarities in the rough form between Tjurs R2 coefficient of discrimination and Youden index for assessing diagnostic test performance on 2×2 contingency tables, the two functions are different.

Keywords: 2 × 2 contingency tables; Binary classification; Diagnostic test accuracy; Logistic regression; Tjur’s R-squared; Youden index.

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Conflict of interest statement

Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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