Contrast Effect size
Hi,
I've used contrast testing (Difference) for a RM ANOVA with 3 levels (T0,T1,T2).
It showed the effect size (cohens d) with JASP, but the reported effect sizes are different from what I calculated by myself, using the formulae (Mean T1- Mean T0)/sd.
For example:
- my calculation: -0.280
- JASP: -0.230
I've used the exact same input.
Can someone explain me how cohens d of the contrast testing (difference) is calculated in JASP?
Then I can figure out the issue in my own calculations.
Thanks!
Eva
Comments
Hi Eva,
Have you computed the same result in a different program (R?). You can also give ChatGPT a shot. If you can't get to the bottom of this please provide a concrete data set so it is easier to discuss the matter.
Cheers,
E.J.