Document (#30088)

Author

Robertson, S.

Title

How Okapi came to TREC

Source

TREC: experiment and evaluation in information retrieval. Ed.: E.M. Voorhees, u. D.K. Harman

Imprint

Cambridge, MA : MIT Press

Year

2005

Pages

S.287-300

Theme

Retrievalstudien

Object

TREC
OKAPI

Similar documents (author)

1. Robertson, M.A.: Windows 3.0 for the online searcher (1991) 4.57

   4.5717874 = sum of:
     4.5717874 = weight(author_txt:robertson in 592) [ClassicSimilarity], result of:
       4.5717874 = score(doc=592,freq=1.0), product of:
         0.99999994 = queryWeight, product of:
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.13670799 = queryNorm
         4.571788 = fieldWeight in 592, product of:
           1.0 = tf(freq=1.0), with freq of:
             1.0 = termFreq=1.0
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.625 = fieldNorm(doc=592)
   

2. Robertson, S.E.: Some recent theories and models in information retrieval (1980) 4.57

   4.5717874 = sum of:
     4.5717874 = weight(author_txt:robertson in 1326) [ClassicSimilarity], result of:
       4.5717874 = score(doc=1326,freq=1.0), product of:
         0.99999994 = queryWeight, product of:
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.13670799 = queryNorm
         4.571788 = fieldWeight in 1326, product of:
           1.0 = tf(freq=1.0), with freq of:
             1.0 = termFreq=1.0
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.625 = fieldNorm(doc=1326)
   

3. Robertson, S.E.: Theories and models in information retrieval (1977) 4.57

   4.5717874 = sum of:
     4.5717874 = weight(author_txt:robertson in 1844) [ClassicSimilarity], result of:
       4.5717874 = score(doc=1844,freq=1.0), product of:
         0.99999994 = queryWeight, product of:
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.13670799 = queryNorm
         4.571788 = fieldWeight in 1844, product of:
           1.0 = tf(freq=1.0), with freq of:
             1.0 = termFreq=1.0
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.625 = fieldNorm(doc=1844)
   

4. Robertson, S.E.: On term selection for query expansion (1990) 4.57

   4.5717874 = sum of:
     4.5717874 = weight(author_txt:robertson in 2650) [ClassicSimilarity], result of:
       4.5717874 = score(doc=2650,freq=1.0), product of:
         0.99999994 = queryWeight, product of:
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.13670799 = queryNorm
         4.571788 = fieldWeight in 2650, product of:
           1.0 = tf(freq=1.0), with freq of:
             1.0 = termFreq=1.0
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.625 = fieldNorm(doc=2650)
   

5. Robertson, S.E.: On relevance weight estimation and query expansion (1986) 4.57

   4.5717874 = sum of:
     4.5717874 = weight(author_txt:robertson in 3875) [ClassicSimilarity], result of:
       4.5717874 = score(doc=3875,freq=1.0), product of:
         0.99999994 = queryWeight, product of:
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.13670799 = queryNorm
         4.571788 = fieldWeight in 3875, product of:
           1.0 = tf(freq=1.0), with freq of:
             1.0 = termFreq=1.0
           7.314861 = idf(docFreq=79, maxDocs=44218)
           0.625 = fieldNorm(doc=3875)
   

Similar documents (content)

1. Robertson, S.E.: OKAPI at TREC-1 (1994) 0.90

   0.9007205 = sum of:
     0.9007205 = product of:
       1.3510807 = sum of:
         0.68032205 = weight(abstract_txt:trec in 7953) [ClassicSimilarity], result of:
           0.68032205 = score(doc=7953,freq=3.0), product of:
             0.46901873 = queryWeight, product of:
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.07000619 = queryNorm
             1.4505222 = fieldWeight in 7953, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.125 = fieldNorm(doc=7953)
         0.67075855 = weight(abstract_txt:okapi in 7953) [ClassicSimilarity], result of:
           0.67075855 = score(doc=7953,freq=1.0), product of:
             0.6700878 = queryWeight, product of:
               1.195283 = boost
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.07000619 = queryNorm
             1.001001 = fieldWeight in 7953, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.125 = fieldNorm(doc=7953)
       0.6666667 = coord(2/3)
   

2. Robertson, S.E.: OKAPI at TREC (1994) 0.71

   0.7090285 = sum of:
     0.7090285 = product of:
       1.0635427 = sum of:
         0.39278415 = weight(abstract_txt:trec in 7952) [ClassicSimilarity], result of:
           0.39278415 = score(doc=7952,freq=1.0), product of:
             0.46901873 = queryWeight, product of:
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.07000619 = queryNorm
             0.8374594 = fieldWeight in 7952, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.125 = fieldNorm(doc=7952)
         0.67075855 = weight(abstract_txt:okapi in 7952) [ClassicSimilarity], result of:
           0.67075855 = score(doc=7952,freq=1.0), product of:
             0.6700878 = queryWeight, product of:
               1.195283 = boost
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.07000619 = queryNorm
             1.001001 = fieldWeight in 7952, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.125 = fieldNorm(doc=7952)
       0.6666667 = coord(2/3)
   

3. Robertson, S.E.; Walker, S.; Beaulieu, M.: Laboratory experiments with Okapi : participation in the TREC programme (1997) 0.68

   0.6755403 = sum of:
     0.6755403 = product of:
       1.0133104 = sum of:
         0.5102415 = weight(abstract_txt:trec in 2216) [ClassicSimilarity], result of:
           0.5102415 = score(doc=2216,freq=3.0), product of:
             0.46901873 = queryWeight, product of:
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.07000619 = queryNorm
             1.0878916 = fieldWeight in 2216, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.09375 = fieldNorm(doc=2216)
         0.5030689 = weight(abstract_txt:okapi in 2216) [ClassicSimilarity], result of:
           0.5030689 = score(doc=2216,freq=1.0), product of:
             0.6700878 = queryWeight, product of:
               1.195283 = boost
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.07000619 = queryNorm
             0.7507508 = fieldWeight in 2216, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.09375 = fieldNorm(doc=2216)
       0.6666667 = coord(2/3)
   

4. Robertson, S.E.: OKAPI at TREC-3 (1995) 0.68

   0.6755403 = sum of:
     0.6755403 = product of:
       1.0133104 = sum of:
         0.5102415 = weight(abstract_txt:trec in 5694) [ClassicSimilarity], result of:
           0.5102415 = score(doc=5694,freq=3.0), product of:
             0.46901873 = queryWeight, product of:
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.07000619 = queryNorm
             1.0878916 = fieldWeight in 5694, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.09375 = fieldNorm(doc=5694)
         0.5030689 = weight(abstract_txt:okapi in 5694) [ClassicSimilarity], result of:
           0.5030689 = score(doc=5694,freq=1.0), product of:
             0.6700878 = queryWeight, product of:
               1.195283 = boost
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.07000619 = queryNorm
             0.7507508 = fieldWeight in 5694, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.09375 = fieldNorm(doc=5694)
       0.6666667 = coord(2/3)
   

5. Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996) 0.65

   0.6454378 = sum of:
     0.6454378 = product of:
       0.96815664 = sum of:
         0.54893255 = weight(abstract_txt:trec in 2998) [ClassicSimilarity], result of:
           0.54893255 = score(doc=2998,freq=5.0), product of:
             0.46901873 = queryWeight, product of:
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.07000619 = queryNorm
             1.1703851 = fieldWeight in 2998, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.699675 = idf(docFreq=147, maxDocs=44218)
               0.078125 = fieldNorm(doc=2998)
         0.41922408 = weight(abstract_txt:okapi in 2998) [ClassicSimilarity], result of:
           0.41922408 = score(doc=2998,freq=1.0), product of:
             0.6700878 = queryWeight, product of:
               1.195283 = boost
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.07000619 = queryNorm
             0.6256256 = fieldWeight in 2998, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.008008 = idf(docFreq=39, maxDocs=44218)
               0.078125 = fieldNorm(doc=2998)
       0.6666667 = coord(2/3)