All the groups that are significantly different from each other can be labeled with different letters, so that groups which are labeled with different letters (e.g. "a" vs. "b" ) are significantly different based on the currently selected post-hoc test.
Select the menu item "Statistics" -> "Label All Post-Hoc Differences (a,b,c)"
To toggle between labeling specific comparisons with symbols (e.g. ✻ or †) to labeling with different letters (a,b,c...), click on the "PostHoc Symbols" toggle button in the Toolbar.
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