R help - Jul 2014 - Post hoc comparissons

Hi Folks,

I have been using the TukeyHSD to conduct post hoc comparisons.  The challenge
is I have two interacting factors, one of which has 6 levels (cover types), and
the other 2 (study areas).    As a result interpreting the post hoc comparisons
is difficult when you get a list of every possible combination (66 of them).  In
grad school I was using SAS and I recall most of the post hoc tests that were
available there provided a nice summary with letters that made it easy to show
which groups differed from one another within an ANOVA model that included a
significant interaction.  Is there a way to summarize my result in R that makes
it easier to indicate significant post hoc comparisons graphically?

Thanks for your help,

Doug Reid
CNFER
Lakehead University


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