jamovi

Is there a reason omega squared is an option for between subjects ANOVA but not repeated measures ANOVA?

It can be done, but is a bit more complicated to produce than the between subjects version. I've got it in Cole Davis (2019) 'Statistical Testing with R' (Vor Press, copyright 2019), but I'll send the jamovi team the code.

According to the article below, the formula is the same for between and RM for partial omega squared and is only slightly different for full omega squared. That's why I was wondering whether I was missing something, because if it's really that simple, it's unclear why it's not an option for RM ANOVA.

Lakens, D. (2013). Calculating and reporting effect sizes to facilitate cumulative science: A practical primer for t-tests and ANOVAs. Frontiers in Psychology, 4(863).

create a github issue for it on our issues page, and we'll see what we can do:

https://github.com/jamovi/jamovi/issues

jonathon