How to understand/interpret this plot ?

General
1

Hi, how to interpret this plot regarding arrows ? What does it mean when arrow is pointing left or right ?

obraz_720
obraz_720719×250 12.1 KB

2

I'm pretty sure this plot was created with the emmeans package, and these are comparison arrows. From the help:

comparisons
Logical value. If TRUE, “comparison arrows” are added to the plot, in such a way that the degree to which arrows overlap reflects as much as possible the significance of the comparison of the two estimates. (A warning is issued if this can't be done.) Note that comparison arrows are not available with summary_emm objects.

There are more explanations in the Comparisons vignette and the Explanation supplement.

3

Thank you, I must read it.