[Mne_analysis] sign of the T-values in permutation_cluster_test

[Fleur GAUDFERNAU]

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Dear MNE community,

I'm using permutation_cluster_test for 2 sample cluster-based tests. I'm quite surprised because I always get positive T-values, even when I expect negative ones. Reversing the order of the 2 arrays (one for each group) yields exactly the same result. Is this normal ?

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