Robertson, M.; Willett, P.: ¬An upperbound to the performance of ranked output searching : optimal weighting of query terms using a genetic algorithms (1996)
0.00
0.0030255679 = product of:
0.0060511357 = sum of:
0.0060511357 = product of:
0.012102271 = sum of:
0.012102271 = weight(_text_:a in 6977) [ClassicSimilarity], result of:
0.012102271 = score(doc=6977,freq=10.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.22789092 = fieldWeight in 6977, product of:
3.1622777 = tf(freq=10.0), with freq of:
10.0 = termFreq=10.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.0625 = fieldNorm(doc=6977)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Describes the development of a genetic algorithm (GA) for the assignment of weights to query terms in a ranked output document retrieval system. The GA involves a fitness function that is based on full relevance information, and the rankings resulting from the use of these weights are compared with the Robertson-Sparck Jones F4 retrospective relevance weight
- Type
- a