matrix with different sizes for ranksum test
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Walter Roberson on 21 Aug 2020
It is the correct approach under the assumption that the structure of A and B do not matter, that the properties of the array elements are independent of position.
That is a valid assumption at times, but in other cases it is not valid at all. For example if A represents student test scores in one class, then the median for each different test could be different and so which row (or column) a value is in could be important.