IRS13 Evaluation Parameters 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. 11-36 P I 2 P 9 12 II I I ,/½8[OCRerr]I<I9>[OCRerr] I I Ranks of Relevant 1, 2, 9, 12 a) First Document Relevant, Total Relevant > 1 Ranks of Relevant 2, 3, 9, 12 b) First Document Non-Relevant, Total Relevant > 1 a = RELEVANT x = NON-RELEVANT 0 = PERFORMANCE ASSUMED WHEN NO DOCUMENTS EXAMINED P P I -------------------0 x 2 Rank of Relevant 1 c) Total Relevant 1, First Rank of Relevant 2 d) Total Relevant 1, First Document Relevant Document Non-Relevant Illustrations of Fourth Method of "Left End Extrapolation" Fig. 21