IRS13 Test Environment chapter E. M. Keen Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 1-37 COLLECTION AND SPECIFIC REQUESTS GE1[OCRerr]ERAL P£QUESTS I I DICTIONARY Average Rank of Number of Average Rank of t[OCRerr]umber of Last Relevant Re quests Last Relevant Requests I I I I I I IRE-i, Abstract, Stem 33.1 9 141.5 8 I I IRE-3, Abstract, Stem 272.7 17 395.2 17 I I CRAN-19 Abstract, Stem 48.8 21 95.3 21 I I ADI, Abstract, Stem 25.4 17 52.3 18 I I I I Comparison of Specific and General Requests using the Average Rank Position of the Last Relevant Document to represent High Recall Need, (Stem Dictionary) Fig. 17