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Very helpful reading on the use of covariates in between-, within- and mixed between- and within-subjects designs. You probably guessed already, co-varying to "correct for" is not the panacea and can actually be detrimental. https://t.co/KgEikcgZWi
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An interesting article highlighting the importance of centering a covariate when using an ANCOVA, and using a repeated measures ANOVA to interpret results for within-subject factors. https://t.co/NMMrdONvBU