Decision Sciences
8 years ago

New Study Reveals Flaw in Common Statistical Analysis Method

Journal of Educational Statistics
Anova of Residuals and Ancova: Correcting an Illusion by Using Model Comparisons and Graphs
Scott E. Maxwell, Harold D. Delaney, Jerry M. Manheimer

Paper Summary

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The study shows that analyzing residuals in ANOVA and ANCOVA can lead to incorrect results. Using the wrong regression coefficient can cause tests to be too lenient or too strict. Instead, comparing models using graphs is a better way to understand and test treatment effects accurately.