non-parametric cluster-based analysis

[Rodolphe Nenert]

Dear Emmanuel, 

If i understand correctly you want to rank your 3 groups on a particular 
condition using the cluster correction. On normal data you would face the 
multiple comparison problem and would need to correct. Here, this need to be 
confirmed, the problem is you're doing cluster correction. Therefore, the 
significant cluster you may find between your groups may vary in "shape". 
Ranking is thus probably nonsense. 
Still, this analysis will tell you what is significantly different between two 
groups. If you want to rank your 3 groups you can choose relevant electrodes 
and make an ANOVA, or if you want to stay with non-parametric, a Kruskal-
Wallis.
Hope this helps, maybe someone else will have a better answer to your 
problem, 

Rodolphe.


On Tue, 26 Oct 2010 16:25:24 +0200, <Emanuel van den Broeke> 
<e.vandenbroeke at ANES.UMCN.NL> wrote:

>Dear fieldtrip users,
>
>I would like to know if I it is allowed to do three single non-parametric 
cluster 
>based analyses and use IndepT-statistics, if I will test three groups (group A 
>vs B, B vs C and A vs C) by . And  is it then nescessarily to adjust post-hoc 
>the p-value of all three comparisons because of multiple comparisons?
>
>Thanx!
>Emanuel
>
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