Hi Iasonas ,
This is a stat question and not an R question.
But the general answer is that it could happen :)

The R question would have been if their is a Tukey HSD for kruskel.test,
the answer is yes:
http://stats.stackexchange.com/questions/17342/is-there-a-nonparametric-equivalent-of-tukey-hsd
But if you didn't get any significant result from the pairwise comparison,
I would say that the post hoc correction wouldn't help you (it could be
that the reason for this significance is based on some weird contrast...)

Best,
Tal





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On Thu, Jan 12, 2012 at 8:35 AM, Iasonas Lamprianou <lamprianou@yahoo.com>wrote:

> Dear all,
>
> I run a kruskal wallis test and found significant results. Then, I
> conducted all pairwise comparisons and found no significant results. Could
> anyone please give me a hint as to why this happens or redirect me towards
> a specific web page where I can find more info? (I used alpha=5% and made
> no bonferroni or other correction for the pairwise comparisons)
> Thank you
>
>
> Dr. Iasonas Lamprianou
> Department of Social and Political Sciences
> University of Cyprus
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>
>
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