Suggestion: Mention formula Cohen's d for paired t-tests
I know your focus is more on the Bayesian analyses, but a brief comment on the classic t-tests: The Cohen's d reported in the output table for (classic) paired t-tests seems to be uncorrected for the correlation between observations. This can lead to overestimation of the effect size according to some authors (e.g., [1] ) Perhaps it would be good to mention that the d value is uncorrected?
[1] alternative formulae for example in Dunlap, W. P., Cortina, J. M., Vaslow, J. B., & Burke, M. J. (1996). Meta-analysis of experiments with matched groups or repeated measures designs. Psychological Methods, 1(2), 170.
Comments
Hi HannaG,
That's a great suggestion, we could add this to the output. By the way, it is easiest to post such suggestions as "feature requests" on the GitHub page. You only need to set up an account once, and it makes it much easier to give feedback to the JASP programming team. I'll post this one for you.
Cheers,
E.J.