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In assessing information retrieval systems, it is important t o know not only the precision of the retrieved set, but also to compare the number of retrieved relevant items to the total number of relevant items. For large collections, such as the TREC test collections, or the World Wide Web, it is not possible to enumerate the entire set of relevant(More)
or schemes for IR may yield results that are better than those of either participating scheme. It has been conjectured that this occurs only rarely, or occurs only when poor schemes are being combined, or occurs only for problems In which there are so few relevant documents that the results are probably due to statistical fluctuation. Based on a geometrical(More)
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