Work

Misunderstanding of analysis of covariance revisited: Commentary on Miller and Chapman (2001).

Year: 2025

Type: article

Abstract: by G. A. Miller and J. P. Chapman (2001). The central thesis of Miller and Chapman is that the analysis of covariance (ANCOVA) is invalid when groups differ on the covariate. Specifically, Miller and Chapman imply that this is an assumption of ANCOVA. However, in the present article, the commentators argue that equivalence of groups on the covariate is not a requirement for valid use of ANCOVA. (PsycInfo Database Record (c) 2026 APA, all rights reserved).

Source: Journal of Psychopathology and Clinical Science

DOI: 10.1037/abn0001062

Authors: Victor Pokorny, Vijay A. Mittal

Institution: Northwestern University

Language: English

Topic: Statistical Methods and Bayesian Inference

Subfield: Statistics and Probability

Field: Mathematics

Domain: Physical Sciences

Open Access status: hybrid

Funder: National Institute of Mental Health

Award: G345597710