What if there are no negative clusters?

[Emanuel van den Broeke]

Dear people
Who can answer my question?

So I understand that is always the best to test two-sided with the non-
parametric permutation test, because one is interested in both directions of 
the effect; so both the positive and negative clusters. but what if your 
observed dat shows no negative clusters? There is no negative cluster 
detected above the threshold. Do you still have to use an alpha of 0.025 then?

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