SP500207 NIST Special Publication 500-207: The First Text REtrieval Conference (TREC-1) Query Improvement in INformation Retrieval Using Genetic Algorithms - A Report on the Experiments of the TREC Project chapter J. Yang R. Korfhage E. Rasmussen National Institute of Standards and Technology Donna K. Harman 0.6 P r 0.5 e C 0.4 S i 0 0.3 n V 0.2 a 1 U e 0.1 0 0.6 P r 0.5 e C 0.4 S i 0 0.3 n V 0.2 a 1 U e 0.1 I I 1111 L I 59 61 79 84 99 89 71 51 57 88 87 67 81 86 72 55 90 9 76 64 78 62 52 82 69 60 68 80 91 92 73 66 65 56 95 54 74100 63 83 75 85 94 53 77 98 % 58 93 70 Topic number (ad-hoc) Upitt :>.> NIST-Median Figure 1. Precision values on 50 ad hoc queries 0 I Ii. 4: 5 3 5 7 16 4., 2 Figure 2. I fi n 4 4 3 [OCRerr]. 3[OCRerr]3'1I -[OCRerr] 3 4[OCRerr] 1 3( 4[OCRerr] 1[OCRerr] 4 4' 2[OCRerr] ( 4' 711159 5.218 25.' 8 29:9:7 Topic number [OCRerr]outing) Upitt NIST-Median Precision values on 32 routing queries 2' 2 55 3