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  • For a test collection, it is usual that a system does crummily on some information needs (e.g., MAP = 0.1) and excellently on others (e.g., MAP = 0.7)

  • Indeed, it is usually the case that the variance in performance of the same system across queries is much greater than the variance of different systems on the same query.

  • That is, there are easy information needs and hard ones!

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