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. X-17 ALL, Low FREQUENCY, HIGH FREQUENCY DICTIONARY EVALUATION 35 REQUESTS 17 REQ[OCRerr]TS 18 REQUESTS MEASURE FREQ. 26-483 FREQ. 26-218 FREQ. 223-483 MEAN 220 MEAN 130 MEAN 305 Stem Normed. Recall e7601 .8154 .7080 Normed. Precision .5326 .56[OCRerr]i .5000 Thesaurus 1 Normed. Recall .8016 .8527 .7533 Normed. Precision e6069 .6717 .5457 Per[OCRerr]ormance Results Con[OCRerr]aring All the Requests, the Requests Having Low Average Frequency Concepts and the Requests Having High Average Frequency Concepts, with Two Dictionaries Figure 7