Waller, W.G.; Kraft, D.H.: ¬A mathematical model of a weighted Boolean retrieval system (1979)
0.06
0.060385596 = product of:
0.09057839 = sum of:
0.051577676 = weight(_text_:management in 5503) [ClassicSimilarity], result of:
0.051577676 = score(doc=5503,freq=2.0), product of:
0.17312427 = queryWeight, product of:
3.3706124 = idf(docFreq=4130, maxDocs=44218)
0.051362853 = queryNorm
0.29792285 = fieldWeight in 5503, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.3706124 = idf(docFreq=4130, maxDocs=44218)
0.0625 = fieldNorm(doc=5503)
0.039000716 = product of:
0.07800143 = sum of:
0.07800143 = weight(_text_:system in 5503) [ClassicSimilarity], result of:
0.07800143 = score(doc=5503,freq=6.0), product of:
0.16177002 = queryWeight, product of:
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.051362853 = queryNorm
0.48217484 = fieldWeight in 5503, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
3.1495528 = idf(docFreq=5152, maxDocs=44218)
0.0625 = fieldNorm(doc=5503)
0.5 = coord(1/2)
0.6666667 = coord(2/3)
- Abstract
- The use of weights to denote a query representation and/or the indexing of a document is analysed as a generalization of a Boolean retrieval system. Criteria are given for the functions used to evaluate the relevance of the records to a specific query, including self-consistency. Various mechnaisms suggested in the literature for evaluating the relevance of records with regard to a given query are tested and found to be less than satisfactory. A new approach is suggested to avoid some of the perils of a weighted Boolean retrieval system
- Source
- Information processing and management. 15(1979), S.235-245
