I used eff_size() function to calculate effect sized of conditions of a lmer object. However, I can't find a rule of thumb for interpreting the effect size. Any guidelines or suggestions?
Many thanks!
> eff_size(post, sigma = sigma(fit), edf = df.residual(fit))
contrast effect.size SE df lower.CL upper.CL
1_1 - 1_3 -0.3418 0.0580 68.7 -0.4575 -0.2261
1_1 - 3_1 -0.3987 0.0579 68.7 -0.5143 -0.2831
1_1 - 3_3 -0.1518 0.0575 68.7 -0.2666 -0.0371
1_3 - 3_1 -0.0569 0.0582 69.2 -0.1730 0.0593
1_3 - 3_3 0.1900 0.0580 68.7 0.0742 0.3058
3_1 - 3_3 0.2468 0.0579 68.7 0.1312 0.3624
sigma used for effect sizes: 0.3014
Degrees-of-freedom method: inherited from kenward-roger when re-gridding
Confidence level used: 0.95