Analysis of covariance and moderation

Content

  • Analysis of covariance and linear regression models
  • Moderation analysis

Learning objectives

At the end of the session, students should be capable of

  • explain the benefits ANCOVA over completely randomized designs
  • using control covariates
  • testing equality of slopes
  • testing for moderating variables (interactions)

Readings

Complementary readings

  • Chapter 6 of Maxwell et al. (2017).
  • Chapter 14–15 of Keppel & Wickens (2004)

Slides

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Videos

Code

Tip

Fun fact: If you type ? (or shift + /) while going through the slides, you can see a list of slide-specific commands.

References

Keppel, G., & Wickens, T. D. (2004). Design and analysis: A researcher’s handbook. Pearson Prentice Hall.
Maxwell, S. E., Delaney, H. D., & Kelley, K. (2017). Designing experiments and analyzing data: A model comparison perspective (3rd ed.). routledge. https://doi.org/10.4324/9781315642956