IRS13 An Analysis of the Documentation Requests 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. ORIGINAL 0 ORIGINAL ORIC ~)DIFIED Precision 1.0 - * MODIFIED Precision dl 1.0 - MOD] 0.8 0.8 - U L 0.6 \N. [OCRerr] 0.4 0.4 0.2 0.2 I I I I I I I I I I I I I 0.2 0.4 0.6 0.8 l.0[OCRerr] 0 0.2 0.4 0.6 0.8 1.0 0 0.2 0.4 0.6 0.8 Recoil Recoil Recoil 0.6 - Abstracts, Sutfix `S' b) Abstracts, Stem c) Abstracts, Thesaurus ADI Documentation Collection, 82 Documents, Averages over 35 Requests Performance Comparisons Between Requests as Received (Original) and Manual Modification by Important "Key11 Term Weight Increases. Fig. 17