Dunn's post hoc test
I don't know Dunn's rank test, but the following substracts each of the sums of averanks from the next rank. cumsum(averank)[-length(averank)] - averank[-1] Hank
On Oct 17, 2005, at 4:30 AM, Iain Gallagher wrote:
Hi Everyone. I am rather new to R and I've been trying to implement a function to carry out the above test. For a couple of days now I've been stuck on how to generate average rank differences. Say I have a vector of average ranks: averank<- c(2,5,9,12) I would like to subtract averank[1] from averank[2], averank[1] and averank[2] from averank[3] and averank[1], averank[2] and averank[3] from averank[4] etc (I know the syntax is wrong here... it's just for illustration) but I can't work out how to do it. Ideally I would like to generate an array showing the differences between the average ranks so I could tell at a glance which ones were greater than my critical value I've been looking at loops etc but it's a little beyond me at the moment. Thanks for any suggestions. Iain Gallagher IIIR Edinburgh University
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