Vechtomova, O.; Karamuftuoglum, M.; Robertson, S.E.: On document relevance and lexical cohesion between query terms (2006)
0.01
0.0121149 = product of:
0.0726894 = sum of:
0.0726894 = weight(_text_:ranking in 987) [ClassicSimilarity], result of:
0.0726894 = score(doc=987,freq=2.0), product of:
0.20271951 = queryWeight, product of:
5.4090285 = idf(docFreq=537, maxDocs=44218)
0.03747799 = queryNorm
0.35857132 = fieldWeight in 987, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
5.4090285 = idf(docFreq=537, maxDocs=44218)
0.046875 = fieldNorm(doc=987)
0.16666667 = coord(1/6)
- Abstract
- Lexical cohesion is a property of text, achieved through lexical-semantic relations between words in text. Most information retrieval systems make use of lexical relations in text only to a limited extent. In this paper we empirically investigate whether the degree of lexical cohesion between the contexts of query terms' occurrences in a document is related to its relevance to the query. Lexical cohesion between distinct query terms in a document is estimated on the basis of the lexical-semantic relations (repetition, synonymy, hyponymy and sibling) that exist between there collocates - words that co-occur with them in the same windows of text. Experiments suggest significant differences between the lexical cohesion in relevant and non-relevant document sets exist. A document ranking method based on lexical cohesion shows some performance improvements.