Robertson, S.E.; Walker, S.: Some simple effective approximations to the 2-Poisson molde for probabilisitc weighted retrieval (1979)
0.00
0.0016913437 = product of:
0.0033826875 = sum of:
0.0033826875 = product of:
0.006765375 = sum of:
0.006765375 = weight(_text_:a in 1940) [ClassicSimilarity], result of:
0.006765375 = score(doc=1940,freq=2.0), product of:
0.053105544 = queryWeight, product of:
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.046056706 = queryNorm
0.12739488 = fieldWeight in 1940, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
1.153047 = idf(docFreq=37942, maxDocs=44218)
0.078125 = fieldNorm(doc=1940)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Type
- a