ISR11 Relevance Feedback in an Information Retrieval System chapter W. Riddle T. Horwitz R. Dietz Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. Results for Query No.12 QAI2JOURNAL Document Rank No. Name Relevant Correlation 1 4 30Th0LE OF/ x .767566[OCRerr] 2 9 206ANALYSIS x .68759401 3 7 21IA CO[OCRerr]4FUTE X .53283944 4 4o 11O2CENTRALI .44774693 5 42 [OCRerr] PHOTO X .31186705 6 75 20IA SYSTEM .28223262 7 33 11Ol7INFORMA .27951524 8 6o 12l2TOWARD A .27811415 9 46 l09STATUS RE .27545574 10 22 914THE RAPID .27181938 11 56 1112THE USE .26324643 12 48 804C0M?UTERI .26323561 13 73 906[OCRerr]CR0FIL[OCRerr]4 .25698269 14 81 l1C[OCRerr]HE AUTO .25179059 15 20 3O4PHOTOGRAP .24952061 Ranking took .183333 seconds Relevant Document Ranks Document Rank No. Name Felevant Correlation 1 4 3O7ROLE OF/ x .76756620 2 9 206ANALYSIS x .68759401 3 7 21IA COMPUTE X .53283944 5 42 203Ii[OCRerr][OCRerr] PHO[OCRerr]O X .31186705 19 25 209THE REDUC X .22573736 v'-65 Normalized Ecall = .9615385 `Tornalized Precision = .9089968 Rank Recall = .5000 Log P::ecision = .7545 No Update for these results (d) Results after Third Up[OCRerr]ate (Increasing Alpha Strategy) Figure 12 (continued)