question about permutation_cluster_test

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Hello,

I juste have a quick question regarding mne.stats.permutation_cluster_test.

When I give it two arrays X1 and X2 of shape (n subjects x n channels x n freq), I have the following error: ValueError: connectivity (len 20484) must be of the correct size, i.e. be equal to or evenly divide the number of tests (2580984).

The error disappear if I reshape X1 and X2 into shape (n subjects x n freq x nchannels).

I was wondering why because I did not see anything about that in the documentation of permutation_cluster_test.

Thanks in advance!

Kind regards,

Fleur
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Hi Fleur,
The **last dimension** of the arrays in X should be the dimension represented by `connectivity`. So this is why it must be (n_subjs x n_freq x n_channels), instead of (n_subjs x n_channels x n_freq). I agree that this is not explained well in [the docstring](https://mne.tools/dev/generated/mne.stats.permutation_cluster_test.html). Would you like to make a pull request suggesting a docstring improvement?

-- dan
Daniel McCloy
https://dan.mccloy.info
Research Scientist
Institute for Learning and Brain Sciences
University of Washington

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Hello,

Thank you for your answer.
I'm sorry, I'm not sure how to make a PR (I'm a M2 student).

Fleur