13. An information retrieval system, comprising: computing hardware; a database operatively coupled with the computing hardware and including documents for delivery to a user in response to a user search; and a non-transitory, computer-readable memory component operatively coupled with the computing hardware and further including: a receiving module configured to, upon actuation by the computing hardware, receive a search query and a corresponding relevancy expectation score from the user; a search module configured to, upon actuation by the computing hardware, search the database against the search query provided by the user and output an original list of results each of which exhibits a numerical score; and a post-processing module configured to, upon actuation by the computing hardware, perform post-processing of the numerical scores of the results of the original list including relevancy expectation score transformation, volume regulation function determination and cut-off score estimation.
14. The information retrieval system as set forth in claim 13 , further comprising a result set filtering module configured to, upon actuation by the computing hardware, filter the results of the original list based on the cut-off score.