Robertson, M.; Willett, P.: ¬An upperbound to the performance of ranked output searching : optimal weighting of query terms using a genetic algorithms (1996)
0.02
0.019400205 = product of:
0.058200616 = sum of:
0.058200616 = weight(_text_:p in 6977) [ClassicSimilarity], result of:
0.058200616 = score(doc=6977,freq=2.0), product of:
0.18313517 = queryWeight, product of:
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.050934367 = queryNorm
0.31780142 = fieldWeight in 6977, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5955126 = idf(docFreq=3298, maxDocs=44218)
0.0625 = fieldNorm(doc=6977)
0.33333334 = coord(1/3)
