How to Interpret Overlapping Letter Tukey's HSD?
I am having a hard time explaining to myself (thus others) how to interpret a Tukey's HSD test between 3 treatment groups, when the letter assignment goes like this: I understand how there isn't enough of a difference between Level 1 subgroup and Level 3 subgroup means to say they are different when viewed pairwise, same with Level 2 and Level 3, while the difference between Level 1 and Level 2 is...