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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