Paired comparisons/contrasts with Emmeans in BayesFactor

Comments

• JohnnyB

  February 2023

  Hi Søren,

  Unfortunately not - the emmeans/contrast functionality is only included in the frequentist ANOVA's in JASP. As far as I know the emmeans package does not include Bayesian analyses, or am I mistaken?

  We do include Bayesian post hoc tests, which will have similar functionality. Since the multiplicity correction of our Bayesian posthoc tests is not included in the Bayes factor (the correction happens on the prior/posterior odds), the post hoc Bayes factor will "just" be the results for pairwise t-tests.

  Kind regards,

  Johnny
• kyllingsbaek

  February 2023

  Hi Johnny,

  Thanks!! From what you write, I would simply run individual pairwise t-tests in BayesFactor for the comparisons that I would like to make? I presume that there is no way to set it up so that it runs all pairs within a given factor?

  Best,

  Søren
• JohnnyB

  February 2023

  Hi Søren,

  The Bayesian post hoc tests do this, and you can just take the Bayes factors from there. Unfortunately we do not have different types of contrasts (e.g. Helmert/simple/etc), which is still on our todo list.

  Kind regards,

  Johnny
• kyllingsbaek

  February 2023

  Hi Johnny,

  Thanks! Sorry for being a bit slow, but is the post hoc tests part of the BayesFactor library in R or only in available in JASP?

  Best,

  Søren
• JohnnyB

  February 2023

  Ahh Im sorry I thought we were discussing JASP. In R you could write some sort of for-loop for stepping through all pairwise comparisons - as far as I know there is no function in BayesFactor that does this for you.
• kyllingsbaek

  February 2023

  No problem :-). That was also what I thought. I'll try to set something up like that.

  Thanks for your help!!!