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RM-ANOVA Post-Hoc T-Test SE is Wrong, no longer pooled
Posted: Tue Oct 19, 2021 8:23 am
by emcourt33
The post-hoc pair-waise comparisons following a repeated measures ANOVA used to use pooled variance and have a consistent SE in each t-test comparison. Now, Jamovi seems to use different SE for each t-test. Is this due to a change in the emmeans function or am I simply doing something wrong?
Re: RM-ANOVA Post-Hoc T-Test SE is Wrong, no longer pooled
Posted: Tue Oct 19, 2021 8:45 am
by Ravi
Hi,
Earlier this year we changed the way we calculate the estimated marginal means (on which the post-hoc tests are based) as per recommendation of the author of the package we use to estimate the RM ANOVA: https://cran.r-project.org/web/packages/afex/vignettes/afex_anova_example.html. It now uses a multivariate model in its calculations: https://github.com/jamovi/jmv/commit/a9c8cb0
Cheers,
Ravi