With the exception of Get_Rank, your new functionality is just implementing order statistics on top of Tie::Hash::Sorted. If one has access to the sorted array, it would seem easier to me to extract the elements directly than download another module, install it, and figure out the API.

But having the functions within the module already would tip the convienence factor the other way. So I would be in favor of including them in your current API for Tie::Hash::Sorted. I expect the methods would be simple to implement and would result in little code bloat.

If you do choose to breakout into a new module, I would recommend a more expressive name like Tie::Hash::RankStatistics. <update> In the area of new methods, I think a median method would be useful: return the middle element, with a well-defined convention for even numbers of hash elements.

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