Is there code in R to automatically assign letters to different groups that are found to be statistically significant using a post-hoc test following an ANOVA? For example, let's say I found that relative rates of tree growth were statistically significant between tree species using an ANOVA and then I ran a TukeyHSD post-hoc test to determine which species were statistically different from one another. I can manually assign different letters for each species that is different from another, but is there code to do this automatically in R. I would like to add these letters to a table, but have many different ANOVAs and doing this manually will be quite time consuming.

Thanks,

Adrienne

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