The Mysterious VS-MPR

For its frequentist analyses, JASP offers familiar output: effect sizes, confidence intervals, and p-values. However, JASP also provides a more mysterious measure: the “Vovk-Sellke maximum p-ratio” or VS-MPR.

This inaugural blogpost features a cartoon that we developed to explain the VS-MPR. The storyboard was developed by Erik-Jan van Kesteren (who also implemented the VS-MPR in JASP) and Eric-Jan Wagenmakers, and the graphical artist is Viktor Beekman. An associated Shiny app with references is available at The cartoon is released under a CC-BY license, which means that you can use it for your own purposes as long as you attribute the source.

Note: The comic consists out of two separate jpg-files. To download them, simply right click and select “save image as”.

About the author

Eric-Jan Wagenmakers

Eric-Jan (EJ) Wagenmakers is professor at the Psychological Methods Group at the University of Amsterdam. EJ guides the development of JASP.