Working Papers

Yarkoni, T., & Westfall, J. (2017). Bambi: A simple interface for fitting Bayesian mixed effects models in Python. Manuscript submitted.

Westfall, J. (2017). Statistical details of the default priors in the Bambi library. arXiv:1702.01201

Westfall, J. (2016). PANGEA: Power ANalysis for GEneral Anova designs.

2017 / In press

Westfall, J., Nichols, T. E., & Yarkoni, T. (2017) Fixing the stimulus-as-fixed­-effect fallacy in task fMRI. Wellcome Open Research, 1:23.

Yarkoni, T., & Westfall, J. (2017). Choosing prediction over explanation in psychology: Lessons from machine learning. Perspectives on Psychological Science.

Judd, C. M., Westfall, J., & Kenny, D. A. (2017). Experiments with more than one random factor: Designs, analytic models, and statistical power. Annual Review of Psychology. [Supplemental appendix: Additional topics]


Wolsiefer, K., Westfall, J., & Judd, C. M. (2016). Modeling stimulus variation in three common implicit attitude tasks. Behavior Research Methods.

Westfall, J., & Yarkoni, T. (2016). Statistically controlling for confounding constructs is harder than you think. PLoS ONE, 11(3), e0152719. [Supplemental appendix: Derivation of statistical properties of incremental validity]

Banchefsky, S., Westfall, J., Park, B., & Judd, C. M. (2016). But you don't look like a scientist!: Women scientists with feminine appearance are deemed less likely to be scientists. Sex Roles.


Westfall, J., Judd, C. M., & Kenny, D. A. (2015). Replicating studies in which samples of participants respond to samples of stimuli. Perspectives on Psychological Science, 10(3), 390-399.

Westfall, J., Van Boven, L., Chambers, J., & Judd, C. M. (2015). Perceiving political polarization in America: Party identity strength and attitude extremity exacerbate the perceived partisan divide. Perspectives on Psychological Science, 10(2), 145-158. [Supplemental material: Elaboration of Method/Results]

Westfall, J., & Judd, C. M. (2015). The conceptual distinction between mediators versus moderators. In R. Cautin & S. Lilienfeld (Eds.), Encyclopedia of Clinical Psychology. Wiley-Blackwell.


Westfall, J., Kenny, D. A., & Judd, C. M. (2014). Statistical power and optimal design in experiments in which samples of participants respond to samples of stimuli. Journal of Experimental Psychology: General, 143(5), 2020-2045.


Van Boven, L., Travers, M., Westfall, J., & McClelland, G. (2013). Judgment and decision making. In D. Carlston (Ed.), Oxford Handbook of Social Cognition. Oxford University Press.

Westfall, J., & Van Boven, L. (2013). Endowment effect. In H. Pashler (Ed.), Encyclopedia of the Mind. Sage Publications.


Judd, C. M., Westfall, J., & Kenny, D. A. (2012). Treating stimuli as a random factor in social psychology: A new and comprehensive solution to a pervasive but largely ignored problem. Journal of Personality and Social Psychology, 103(1), 54-69.