Effect of covariates on post-hoc tests in Bayesian ANCOVA
Hi,
I am trying to run a Bayesian ANCOVA in JASP with one fixed factor with three levels and one (continuous) covariate (added to the null model).
I have noticed that when conducting pairwise post-hoc tests, the inclusion of the covariate does not seem to have any effect on the results (i.e. Bayes Factors etc. for the post-hoc comparisons are the same whether the covariate is included in the model or not).
Is there any way of conducting post-hoc tests that take into account covariates as it is possible in the case of the frequentist ANCOVA?
Many thanks for your help!
Best wishes,
Julia
Comments
Hi Julia,
Good question -- I'll forward this to our expert.
Sorry about the delay.
Cheers,
E.J.
Hi Julia,
The pairwise post-hoc tests are simply independent t-tests with a correction for multiple testing. So including or excluding a covariate does indeed not impact the results. As far as I know, we currently do not offer a way to include covariates in Bayesian post-hoc tests.
I hope that answers your questions.
Best,
Don
Addendum: but it would be a good idea to develop this functionality in the future!
EJ