Help with Reading a Connecting Letters Report
For pairwise comparisons, I understand the core idea in the Connecting Letter Report, is that if two groups don't share a letter they are significantly different. In the example posted here, I don't understand why we need both of the two first columns --- the second column appears to make the first one redundant since the second column tells us that all pairs between grp_0, grp_1, grp_3, grp_4, gr...