CRANV2 subject index subject index 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. - 299 - SUBJECT INDEX Abstracts. 186, 254, 258 Adjusted precision ratio. 73 Aerodsmamic questions. 228, 255 Average of numbers. 53, 205 Average of ratios. 53, 205, 225 Averaging sets of results. 51 Basic questions. 225 Bibliographic coupling. 243 Citation indexing. 243 Collection size. 4, 256 Comparative results. 221 'Composite' measures. 43, 49 'Composite, table. 16 Concept-indexing. 7, 258 Confounding of word forms. 9 Contingency table. 33, 49 Controlled terra index languages. 11, 159, 254, 262 Coordination level. 56, 80, 202, 23O Dictionary compilation. 259 Distillation ratio. 39 Document output cut-off. 69, 200, 262 Document relevance. 15, 80, 140, 215, 223 Effectiveness measure. 44 Exhaustivity of indexing. 6, 7, 78, 121, 186, 215, 258 Environmental factors. 4, 21, 255 Evaluation of operational systems. 256 Fallout ratio. 36, 39, 81 Generality number. 71, 80 Hardware factors. 4, 6 Index language groups. 78 Information retrieval system defined. 4 Int erfixing, i2, 109 Linear composite measures. 44 'Measure of merit,. 48 Noise factor. 36 Non-linear composite measures. 48 Normalised recall ratio. 202, 205, 215, 254, 259 Number of postings. 234, 259 Operational factors. 4, 6 Order of effectiveness. 209, 254 Order of retrieval of relevant documents. 239 Partitioning. 12, 109 Performance measures. 32 Precision devices. 11, 78, 109, 159, 234, 255 Precision ratio. 35, 81 Presentation of results. 31 Q factor. 48 ' Quasi-synonyms. 9, 11 Question generality. 234 Question sets. 21, 80, 83, 225, 228 Rank order number. 195 Recall devices. 11, 100, 148, 159 Recall ratio. 35, 81 Relevance decisions. 256 Relevance of the documents. 15, 80, 140, 215, 223 Search rules. 12, 78, 109, 131, 159, 205 Simple concept index languages. 148, 254 Simulated ranking method. Single term index language. 221, 254, 262 SMART searches. 202 Snobbery ratio. 35 Software factors. 4, 6 Specificity. 6, 255 Starting term coordination level. 71 Stated relevance. 256 Structure questions. 228, 255 Subject field. 4, 228, 255 Supplementary questions. 225 Term clusters. 9 Term usage. 7 Titles. 186, 254, 258 Totalling results. 56 Twin variable measures . 36 User relevance. 256 Weighting. 12, 78, 121 Weighting related to relevance grading. 215 11, 195, 205 9. 83, 61,