Hostname: page-component-89b8bd64d-rbxfs Total loading time: 0 Render date: 2026-05-08T02:15:27.828Z Has data issue: false hasContentIssue false

Modeling Concordance Correlation Coefficient for Longitudinal Study Data

Published online by Cambridge University Press:  01 January 2025

Yan Ma*
Affiliation:
Hospital for Special Surgery–Weill Medical College of Cornell University
Wan Tang
Affiliation:
University of Rochester
Qin Yu
Affiliation:
University of Rochester
X. M. Tu
Affiliation:
University of Rochester
*
Requests for reprints should be sent to Yan Ma, Department of Public Health, Hospital for Special Surgery–Weill Medical College of Cornell University, New York, NY 10021, USA. E-mail: yam2007@med.cornell.edu

Abstract

Measures of agreement are used in a wide range of behavioral, biomedical, psychosocial, and health-care related research to assess reliability of diagnostic test, psychometric properties of instrument, fidelity of psychosocial intervention, and accuracy of proxy outcome. The concordance correlation coefficient (CCC) is a popular measure of agreement for continuous outcomes. In modern-day applications, data are often clustered, making inference difficult to perform using existing methods. In addition, as longitudinal study designs become increasingly popular, missing data have become a serious issue, and the lack of methods to systematically address this problem has hampered the progress of research in the aforementioned fields. In this paper, we develop a novel approach to tackle the complexities involved in addressing missing data and other related issues for performing CCC analysis within a longitudinal data setting. The approach is illustrated with both real and simulated data.

Information

Type
Theory and Methods
Copyright
Copyright © 2010 The Psychometric Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable