How do I perform a mediation analysis in analysis of covariance (ANCOVA)?

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David Eugene Booth

Same way as always. Just add the covariate as an IV to your regression model. Google mediation moderation research virginia R covariate for examples. Best, David Booth

Daniel Wright

You need to decide whether to have post-pre as the DV, or have post as the DV and pre as a covariate. There is lots on this. Google Lord's paradox. For example: Article Allocation to groups: Examples of Lord's paradox

. This paper notes that one of the things that will inform your choice is how variables influence your two Z variables.