Jose -
Before implementing SNK and Duncan's, you may want to be aware of some
criticisms of these methods:
>From Hsu (1996),
"Newman-Keuls multiple range test is not a confident inequalities method and
cannot be recommended."
"Duncan's multiple range test is not a confident inequalities method and
cannot be recommended either. In the words of Tukey (1991), Duncan's
multiple range test was a 'distraction' in the history of multiple
comparisons, amounting to 'talking 5% while using more than 5%
simultaneous'"
@Book{Hsu1996,
author = {Jason C. Hsu},
title = {Multiple Comparisons: Theory and Methods},
publisher = {Chapman & Hall},
year = {1996}
}
-- Jim
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