Richard M. Barton <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Suppose I have 4 groups, and want to compare means. I do a
> one-way ANOVA using Bonferroni (my choice) contrasts to get
> at pairwise differences.
> Suppose I decide that I have non-normality problems and decide
> to treat dependent variable as ranks. I can do a Kruskal-Wallis
> test, or equivalently (I'm 99.9% sure) do a one-way ANOVA
Equivalent if you take proper account of the distribution of
ranks, yes.
> on the ranks. Can I then look at the Bonferroni pairwise tests as
> a reasonable follow-up for looking at where the differences lie
> (I'm only 75% sure I can)???
Only in a rough sense. There are multiple comparison procedures
specifically for the Kruskal-Wallis. See, for example, Neave and
Worthington's "Distribution-Free Tests". You might also find
something in Conover, but I don't have it to hand, or I'd check.
Procedures are given in several books.
Glen
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