Simple Main Effects in JASP - R code?

chris383 · February 2021

Hi,

I was wondering if anyone knew what R package or code JASP uses for running Simple Main Effects. I know RM anova is through aov_car, but looking through that package, it doesn't seem to have a method for that. Does JASP just filter (via dplyr) for the simple effect factor and run another ANOVA? Does it use the tidyverse and nest/unnest factors and just run a regular aov? I used to try and look through the R code I could find on Github from JASP, but it's become a lot harder to do that, so I apologize if this is an obvious question.

Thanks!

MSB · February 2021

In R, all the follow up analyses are done with the {emmeans} package.

Contrasts with emmeans::contrasts
Simple effects with emmeans::joint_tests
Etc...

EJ · February 2021

I'll ask, but the help file does mention the emmeans package, so that would support the conjecture from MSB.

E.J.

JohnnyB · February 2021

Hi Chris,

All JASP modules are now in separate github modules - you can see the ANOVA repository here.

The R code for the simple main effects is on line 1573. The computation is a combination of emmeans and some manual computations for correcting the sums of squares and degrees of freedom.

Kind regards

Johnny

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