IRS13 Document Length 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. Abstract, Cranfield Project Word Form 0 Language [OCRerr]-2 Indexing Cranfield Project Word Form Language 15o 0Abstract, Cranfield Project Word Language [OCRerr]-2 0 Indexing Cronfield Project Word Language 13a [OCRerr]recision Precision 1.0 1.0 - L x 0.8 0.8 - 0.6 0.6 - 0.4 - \x¾ 0.4 - 0.2 0.2 I I I 1.0 [OCRerr] Recall I [OCRerr] Recal 0 0.2 0.4 0.6 0.8 0 0.2 0.4 0.6 0.8 1.0 CRAN-l, 42 Requests a) Plot constructed by keyword matching (coordination levels) CRAN-l, 42 Requests b) Plot constructed by a simulated ranki method and a document output cut-off Cranfield Project Results Comparing Abstracts and Indexing, using Precision versus Recall Plots Constructed by Two Cut-off Methods. Fig. 32