Hello dear R-help mailing list,

A friend of mine teaches a regression and experimental design course and
asked me the following question.

She is trying to find a way to display the "homogeneous groups" (after
performing tukey test on an aov object).

here's an example for what she means by "homogeneous groups":
She did one way anova and got these results for tukey test:
> TukeyHSD(hci_anova)
  Tukey multiple comparisons of means
    95% family-wise confidence level
Fit: aov(formula = time ~ interface, data = hci)
$interface
         diff          lwr         upr       p adj
B-A  -23.75   -73.732836    26.23284   0.4165355
C-A    31.25   -18.732836    81.23284   0.2415169
C-B    55.00     5.017164   104.98284   0.0323006

now, she says, since she can see that the only significant difference is
between C and B treatments, then B and A are on the same group (no
significant difference),  C and A are on the same group, but B anc C are not
in the same group. so we should have two groups:
A and B
A and C

Apparently SPSS output gives the homogeneous subsets.


Do you know of a way in R to do that?
Also, since I am unfamiliar with this presentation, do you believe it is
useful/has value?


Thanks,
Tal



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