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I have a large set of items and, two-by-two, there exists some kind of attraction/repulsion that I have measured.

Under different circumstances this attraction/repulsion changes.

So, what kind of statistical/mathematical procedure can I use to test whether the changes (for the whole set) are “large/small”?

If I want to test whether in a subset of them (lets say the first ten items) the attraction is larger than in another subset (lets say the last ten items), how can I do it?.

Thanks in advance

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# Test whether matrixes are equal

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