Mathematics
6 years ago

Interaction Matters: ANCOVA vs. MODREG Reveals Risk of Misestimating Treatment Effects

Health Professions Education
Analysis of Covariance (ANCOVA) vs. Moderated Regression (MODREG): Why the Interaction Matters
Jimmie Leppink

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ANCOVA and MODREG are statistical methods used in research studies. ANCOVA assumes no interaction between factors, while MODREG allows for interaction. If there is significant interaction, ANCOVA may give incorrect results about group differences. It is important to check for interaction and choose the appropriate method based on the results. If ANCOVA is used, any omitted terms should be reported.