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Is it possible to do a Dunnetts or Dunns type multiple comparison versus control group procedure following finding a positive Kruskal Wallis ANOVA in StatsDirect?

April 26, 2017comparison CONTROL dunn dunnett group possible procedure type versus

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Is it possible to do a Dunnetts or Dunns type multiple comparison versus control group procedure following finding a positive Kruskal Wallis ANOVA in StatsDirect?

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You can use the all possible contrasts method that is already included with the Kruskal Wallis function in StatsDirect. This has less power to detect a difference between comparison groups and a control group than an hypothetical nonparametric analogue of Dunnett’s method, nevertheless, any statistically significant difference detected should be investigated further. We will look into writing a nonparametric analogue to Dunnett’s method [Chris Palmer, cp255@cam.ac.uk wants to be notified when this is done].