How much bias results if a quasi-experimental design combines local comparison groups, a pretest outcome measure and other covariates?: A within study comparison of preschool effects

• Published in: Psychological methods
• Main Authors: Cook, Thomas D, Zhu, Naixin, Klein, Alice, Starkey, Prentice, Thomas, Jaime
• Format: Journal Article
• Language: English
• Published: United States 01.12.2020

This study uses a within study comparison design (WSC) to conduct a novel test of how much causal bias results when researchers use a nonequivalent comparison group design type (NECGD) that combines: (a) a comparison group local to the treatment group; (b) a pretest measure of the study outcome; and...