The sum_of_ranks_between function from Statistics::Data::Rank is very slow on large data sets.1 Is there a faster way to do the same thing, i.e. find the sum of ranks of a subset where ranking is across a pooled set? I don't need the other functions from that module (except new, of course), and need the sum_of_ranks_between function only in its sum_of_ranks_between(lab=>...) form.

1 I have two subsets, each with about a million data points.

In reply to Seeking a fast sum_of_ranks_between function by msh210

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