The usual Pearson correlation in particular is also insensitive to positive affine transformations of either player’s utility, so seems to be about the right thing, doesn’t just try to check if the incomparable utility values are equal.
The usual Pearson correlation in particular is also insensitive to positive affine transformations of either player’s utility, so seems to be about the right thing, doesn’t just try to check if the incomparable utility values are equal.