[R] means comparison in R (post-hoc test)

[Felipe]

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Hi.

I have been using SAS for some time, and now I have discovered R. I am
very happy with it, but I have not found out how to perform some of the
multiple comparisons I was used to do in SAS.

With the SAS/STAT, I generally used the MEANS (for comparison of
arithmetic means) and the LSMEANS (for adjusted means) statements of the
GLM procedure (I think it is equivalent to lm in R). They provided a lot
of tests: LSD, Duncan, Tukey-Kramer, Bonferroni, Scheffé, SNK, etc.
However, in R I have only discovered Tukey-HSD.

I have searched for information about this, but I was not successful. I
wonder if anybody knows where I could learn about this. I would like to
use these tests in R, and also obtain the adjusted means like these
produced by the LSMEANS statement.

Thank you.

Felipe
- ----------------------------------oOo----------------------------------
Felipe Martínez-Pastor (BSc, PhD)
Animal Reproduction and Obstetrics
Veterinary Clinic Hospital
24071-León (Spain)
Phone: 987 291 430 / 987 291 000 + 5203
Fax: 987 295 203
e-mail: dbcfmp at unileon.es

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