IRS13 Scientific Report No. IRS-13 Information Storage and Retrieval 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