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. 11-34 p I 2 p I I I I I I I I I I I I I p 9 12 II I I 3 2½ I R R[OCRerr]s of Relevant 1, 2, 9, 12 a) First Document Relevant, Total Relevant > 1 Ranks of Relevant 2, 3, 9, 12 b) First Document now Relevant, Total Relevant > 1 p L p Relevant x = Non-relevant D = Performance assumed until a relevant document examined p 0 2 R Ra[OCRerr] of Relevant 1 c) Total Relevant 1, Document Relevant Rank of Relevant 2 First d) Total Relevant 1, First Document Non-relevant Illustration of Second Method of "Left [OCRerr]d Extrapolation" Fig. 19