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. - 179 - FIGURE 4. 830T Index Language llI. I. e (Controlled terms. Basic terms. Coordination, weighting) Exhaustlvlty of Indexing 3 Search Rule E Document Relevance 1 - 4 Number of Documents in CoZlection 200 (Subset 1) Number of Questions 42 (Subset 2) Number of Relevant Documents 198 GeneraLity Number 23.6 Coord- Documents Recall Precision Fa2[OCRerr]out Inatlon Retrieved Ratio Ratio RatŁo x y z Level Rel. Non-rel. a/a+c a/a+b b/b+d 1 i55 ( ) 78.3% (-) (-) 42 0 42 2 90 215 45.5% 29.5% 2.621% 36 42 42 3 39 27 I9.7% 59.1% O. 329% 23 41 41 4 11 4 5.6% 73.3% O, 049% 7 34 34 5 6 0 3.0% i oo. 0% o. 000% 3 24 24 6 0 0 0 13 13 7 0 0 0 8 8 8 0 0 0 4 4 9 0 0 0 3 3 ioo 9o o[OCRerr] 8O 6O \ ,40 30 20 io o io 20 30 \ 40 SO 60 °Io PRECISION 70 80 90 I00 FIGURE 4.830P INDEX LANGUAGE IH. l.e SEARCH E (Index Language III.l.a Broken Line)