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. vI-58 Results for Query No. 28 [OCRerr]1lINDEX Document Rank No. Nazne Relevant Correlation 1 15 61OCHARACTER .561951149 2 8 1109A PROGRA .[OCRerr]8ll25214 3 6 1106A N[OCRerr] CE .1436143578 14 30 14O9RELATIONA .1411478068 5 65 SOSTHE PLACE .381490018 6 7 21IA COMPUTE .31622777 7 9 206ANALYSIS .31108551 8 61 516AN EXPERI .30618622 9 148 8O14COMFUTERI .28867513 10 28 506THE ROLE .2614906147 11 20 3O14PHOTOGRAP .25819889 12 57 603COMPILATI .231145502 13 142 203[OCRerr]TEW. PHOTO .18983160 i14 51 11l5S0[OCRerr][OCRerr] OBS .18983160 15 80 lOO1DESIGN 0 .181490007 Ranking took .056667 seconds Relevant Document Ranks Lifi. Name Re orrelation [;;½ent1_____________ X }C.13801311 21 36 lilOCOMPUTER levant Normalized Recall = .7560976 Normalized Precision = .3091181 Rank Recall = .01476 Log Precision = 0 N Query(1) = Query(0) + Alpha [OCRerr] T,.[OCRerr]IGHT(I) * Document of Rank I 1=1 (1) Document Rank 1 2 3 14 5 6 7 8 9 10 11 12 13 i14 15 Weight -1-1 0 0 0 0 0 0 0 0 0 0 0 0 0 N = Number of retrieved documents Alpha = 1 Update plus matching took 7.1416667 seconds (a) Initial Results (Increasing Alpha Strategy) Continued Use of Negative Weights when Use in the First Update Fails to Move [OCRerr]uery into Correct Region of N-Space CoBine Correlation Function Figure 11