Help with a more flexible funtion for multiple comparisio n of means

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