IRS13 Suffix Dictionaries 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. vi-8 STEM(S) VERSUS SUFFIX `59(x) COLLECTION INPUT AND PRECISION AT RECALL NORMALIZED MATCHINO FUNCTION .2 .5 .8 REC. H[OCRerr]E. IRE-3 Abstract, Cosine Logical S S X S S 3[OCRerr] Requests Abstract, Overlap Logical x x x S S Text, Cosine Logical x x S X X ADI Text, Overlap Logical x S S X X 35 Requests Abstract, Cosine Logical S S S S S Title, Cosine Numeric S S X S S The merit of one dictionary over the other in these results is always by less than 0.05 precision, normalized recall and normalized precision. Table Su[OCRerr]arizing Six Precision Vursus Recall Plots not Presented, Con[OCRerr]aring Stem and Suffix `5[OCRerr] Dictionaries for Six Options on Two Collections. Figure [OCRerr].