Dear Ged,
thanks very much for this. Your script is working nicely. I also checked the
SnMP site, were they actually suggest your approach:
A two-sided test may be constructed by doing two separate
analyses, one for each tail, at half the chosen significance
level, doubling the resulting p-values.
( Strictly speaking, this is not equivalent to a rigorous two-sided )
( non-parametric test using the permutation distribution of the )
( absolute maximum statistic, but it'll do! )
Anyway, I am quite happy now - almost :) There is just another thing, in
case I would like to use the cluster-based images as well and combine them
using your script, would that still be valid?
Thanks very much for everything,
Torsten
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