Waller, W.G.; Kraft, D.H.: ¬A mathematical model of a weighted Boolean retrieval system (1979)
0.01
0.01072458 = product of:
0.032173738 = sum of:
0.032173738 = product of:
0.064347476 = sum of:
0.064347476 = weight(_text_:indexing in 5503) [ClassicSimilarity], result of:
0.064347476 = score(doc=5503,freq=2.0), product of:
0.19018644 = queryWeight, product of:
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.049684696 = queryNorm
0.3383389 = fieldWeight in 5503, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.8278677 = idf(docFreq=2614, maxDocs=44218)
0.0625 = fieldNorm(doc=5503)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- 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