IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
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-21
SPECIFIC, GENERAL,
EVALUATION LONG Aś[OCRerr] SHORT AND
DICTIONARY MEASURE LOW F[OCRerr]E[OCRerr]UENCY, HIGH FREQUENCY,
9 REQUESTS 10 REQUESTS
Stem Normed. Recall .8309 .5812
Normede Precision .6085 .[OCRerr]O72
I Thesaurusi Normed. Recall .8617 .72147
( Normede Precision .6702 .5870
Performance Results Comparing Two Subsets of the Requests Having the
Expected Correlations Between Length, Generality and Average Concept Frequency
Figure 10.