[R] Nonparametric Tukey-type multiple comparisons "Nemenyi" test

Rikki Dunsmore Rikki.Dunsmore at noaa.gov
Tue May 3 01:45:20 CEST 2005

I am trying to do a Nonparametric Tukey-type multiple comparison 
post-hoc test to determine which groups are significantly different.  I 
have read the dialogue on this topic from the R-help, and am still not 
clear why no statistical packages include this test as an option?  Is it 
not an appropriate test to conduct on non-normally distributed data?  Is 
the only option to calculate it by hand using the (Zar 1996) formula?

Thank you in advance for your help. 

Rikki Grober- Dunsmore
National Marine Fisheries Service
National Marine Protected Areas Center
110 Shaffer Rd.
Santa Cruz, CA 95060

Unless someone like you,
Cares a whole awful lot,
Nothing is going to get better,
It's not.
       - The Lorax, by Dr. Seuss, 1971

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