CRANV2 Main test results chapter Cyril Cleverdon Michael Keen Cranfield An investigation supported by a grant to Aslib by the National Science Foundation. Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. - 91 - FIGURE 4. 113T Index Language L 5. a (S. T. Synonyms, Quasl-synonyms. Coordlnatitm) Exhau[OCRerr]tivity of Indexing 3 Search Ru]e A Document Relevance I - 4 Number of Documents in Collection 1. 400 Number of Questions 35 (subset 1) Number of Relevant Documents 287 Generality Number 5.9 Coord- Documents Recall ination Precision Retrieved Fallout Ratio Level Rel. Non-rel. Ratio a/a+c Ratio a/a+b x y = b/b+d 1 28o (-) 07.6% (-) (.) 2 253 17.130. 35 88.2% 0 35 1.5%* 34.959%* 3 194 7,472 35 67.6% 2.5% 23* 35 15.339% 35 35 35 4 i25 2,086 43.6% 6 5.6% 65 463 4.262% 22.7% 34 35 35 6 12,3% 35 0.950% 30 86 35 35 12.2% 28.4% 0.181% 16 35 35 7 II 16 3.0% 38.0% 0.037% 6 35 35 FIGURE 4. lI4T Index Language I. 6.a (S.T. Synonyms, Quasi-synonyms° Word forms. Exhauativity of Indexing 3 Search Rule A Document Relevance 1 - 4 Number of Documents in Collection 1,400 Number of Questions 35 (Subset 1) Number of Relevant Documents 287 Generality Number 5.9 Coordination) Coord- Documents Recall Precision Fallout Ination Retrieved Ratio Ratio Ratio x y z Level Rel. Non-rel. a/a+c a/a[OCRerr]h b/b+d I 260 (-) 97.6% (-) (-) 2 255 19,264, 88.9% 1.3%* 35 39.31%* 0 35 3 202 8,070 70.4% 35 23* 2.4% 35 16.566% 35 35 35 4 130 2,426 45.3% 5.1% 35 5 72 571 4.980% 25.1% 35 35 11.2% 1.172% 6 38 109 30 13.3% 35 25.8% 36 0.224% 18 35 35 4.6% 40.6% 0.039% 6 35 35 i ii :ili i!i! !ii! i i i!: i! tt! hl¸