Error message while running Tukey post hoc test
I ran a One-way Anova using this dataset:
Discrepancy between grouped and ungrouped output of HSD.test from agricolae package in r
HSD.test with group=TRUE assigned different significance letters to all three groups in the PlantGrowth dataset, but when HSD.test is run again with group=FALSE, the control group shows no significant difference from the other treatments. Why would this occur, and does this mean the letter groupings from HSD.test don’t always indicate significant differences between groups?