Document (#37528)

Author
Egghe, L.
Title
Theory of the topical coverage of multiple databases
Source
Journal of the American Society for Information Science and Technology. 64(2013) no.1, S.126-131
Year
2013
Abstract
We present a model that describes which fraction of the literature on a certain topic we will find when we use n (n = 1, 2, .) databases. It is a generalization of the theory of discovering usability problems. We prove that, in all practical cases, this fraction is a concave function of n, the number of used databases, thereby explaining some graphs that exist in the literature. We also study limiting features of this fraction for n very high and we characterize the case that we find all literature on a certain topic for n high enough.
Theme
Informetrie

Similar documents (author)

  1. Egghe, L.: Little science, big science and beyond (1994) 4.72
    4.7200103 = sum of:
      4.7200103 = weight(author_txt:egghe in 6883) [ClassicSimilarity], result of:
        4.7200103 = fieldWeight in 6883, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5520167 = idf(docFreq=60, maxDocs=42740)
          0.625 = fieldNorm(doc=6883)
    
  2. Egghe, L.: Expansion of the field of informetrics : the second special issue (2006) 4.72
    4.7200103 = sum of:
      4.7200103 = weight(author_txt:egghe in 7119) [ClassicSimilarity], result of:
        4.7200103 = fieldWeight in 7119, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5520167 = idf(docFreq=60, maxDocs=42740)
          0.625 = fieldNorm(doc=7119)
    
  3. Egghe, L.: Expansion of the field of informetrics : origins and consequences (2005) 4.72
    4.7200103 = sum of:
      4.7200103 = weight(author_txt:egghe in 1979) [ClassicSimilarity], result of:
        4.7200103 = fieldWeight in 1979, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5520167 = idf(docFreq=60, maxDocs=42740)
          0.625 = fieldNorm(doc=1979)
    
  4. Egghe, L.: ¬The amount of actions needed for shelving and reshelving (1996) 4.72
    4.7200103 = sum of:
      4.7200103 = weight(author_txt:egghe in 4463) [ClassicSimilarity], result of:
        4.7200103 = fieldWeight in 4463, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5520167 = idf(docFreq=60, maxDocs=42740)
          0.625 = fieldNorm(doc=4463)
    
  5. Egghe, L.: Special features of the author - publication relationship and a new explanation of Lotka's law based on convolution theory (1994) 4.72
    4.7200103 = sum of:
      4.7200103 = weight(author_txt:egghe in 5137) [ClassicSimilarity], result of:
        4.7200103 = fieldWeight in 5137, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5520167 = idf(docFreq=60, maxDocs=42740)
          0.625 = fieldNorm(doc=5137)
    

Similar documents (content)

  1. Hood, W.W.; Wilson, C.S.: Overlap in bibliographic databases (2003) 0.12
    0.12448511 = sum of:
      0.12448511 = product of:
        0.44458967 = sum of:
          0.060115214 = weight(abstract_txt:coverage in 2869) [ClassicSimilarity], result of:
            0.060115214 = score(doc=2869,freq=2.0), product of:
              0.113092035 = queryWeight, product of:
                1.0745311 = boost
                6.0139165 = idf(docFreq=283, maxDocs=42740)
                0.01750071 = queryNorm
              0.5315601 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.0139165 = idf(docFreq=283, maxDocs=42740)
                0.0625 = fieldNorm(doc=2869)
          0.03747718 = weight(abstract_txt:theory in 2869) [ClassicSimilarity], result of:
            0.03747718 = score(doc=2869,freq=1.0), product of:
              0.13101077 = queryWeight, product of:
                1.6355788 = boost
                4.576989 = idf(docFreq=1194, maxDocs=42740)
                0.01750071 = queryNorm
              0.28606182 = fieldWeight in 2869, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.576989 = idf(docFreq=1194, maxDocs=42740)
                0.0625 = fieldNorm(doc=2869)
          0.0151810935 = weight(abstract_txt:that in 2869) [ClassicSimilarity], result of:
            0.0151810935 = score(doc=2869,freq=2.0), product of:
              0.07172399 = queryWeight, product of:
                1.7114538 = boost
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.01750071 = queryNorm
              0.21165991 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.0625 = fieldNorm(doc=2869)
          0.06382269 = weight(abstract_txt:high in 2869) [ClassicSimilarity], result of:
            0.06382269 = score(doc=2869,freq=2.0), product of:
              0.14828679 = queryWeight, product of:
                1.74008 = boost
                4.8694243 = idf(docFreq=891, maxDocs=42740)
                0.01750071 = queryNorm
              0.43040037 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.8694243 = idf(docFreq=891, maxDocs=42740)
                0.0625 = fieldNorm(doc=2869)
          0.07310159 = weight(abstract_txt:topic in 2869) [ClassicSimilarity], result of:
            0.07310159 = score(doc=2869,freq=2.0), product of:
              0.1623318 = queryWeight, product of:
                1.820622 = boost
                5.0948124 = idf(docFreq=711, maxDocs=42740)
                0.01750071 = queryNorm
              0.45032203 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.0948124 = idf(docFreq=711, maxDocs=42740)
                0.0625 = fieldNorm(doc=2869)
          0.12183318 = weight(abstract_txt:databases in 2869) [ClassicSimilarity], result of:
            0.12183318 = score(doc=2869,freq=6.0), product of:
              0.18111432 = queryWeight, product of:
                2.355266 = boost
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.01750071 = queryNorm
              0.67268664 = fieldWeight in 2869, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.0625 = fieldNorm(doc=2869)
          0.07305873 = weight(abstract_txt:literature in 2869) [ClassicSimilarity], result of:
            0.07305873 = score(doc=2869,freq=2.0), product of:
              0.1857509 = queryWeight, product of:
                2.3852234 = boost
                4.4498587 = idf(docFreq=1356, maxDocs=42740)
                0.01750071 = queryNorm
              0.39331564 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.4498587 = idf(docFreq=1356, maxDocs=42740)
                0.0625 = fieldNorm(doc=2869)
        0.28 = coord(7/25)
    
  2. Hood, W.W.; Wilson, C.S.: ¬The scatter of documents over databases in different subject domains : how many databases are needed? (2001) 0.10
    0.103216164 = sum of:
      0.103216164 = product of:
        0.43006736 = sum of:
          0.08501576 = weight(abstract_txt:coverage in 937) [ClassicSimilarity], result of:
            0.08501576 = score(doc=937,freq=4.0), product of:
              0.113092035 = queryWeight, product of:
                1.0745311 = boost
                6.0139165 = idf(docFreq=283, maxDocs=42740)
                0.01750071 = queryNorm
              0.75173956 = fieldWeight in 937, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                6.0139165 = idf(docFreq=283, maxDocs=42740)
                0.0625 = fieldNorm(doc=937)
          0.010734654 = weight(abstract_txt:that in 937) [ClassicSimilarity], result of:
            0.010734654 = score(doc=937,freq=1.0), product of:
              0.07172399 = queryWeight, product of:
                1.7114538 = boost
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.01750071 = queryNorm
              0.14966616 = fieldWeight in 937, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.0625 = fieldNorm(doc=937)
          0.045129456 = weight(abstract_txt:high in 937) [ClassicSimilarity], result of:
            0.045129456 = score(doc=937,freq=1.0), product of:
              0.14828679 = queryWeight, product of:
                1.74008 = boost
                4.8694243 = idf(docFreq=891, maxDocs=42740)
                0.01750071 = queryNorm
              0.30433902 = fieldWeight in 937, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.8694243 = idf(docFreq=891, maxDocs=42740)
                0.0625 = fieldNorm(doc=937)
          0.07310159 = weight(abstract_txt:topic in 937) [ClassicSimilarity], result of:
            0.07310159 = score(doc=937,freq=2.0), product of:
              0.1623318 = queryWeight, product of:
                1.820622 = boost
                5.0948124 = idf(docFreq=711, maxDocs=42740)
                0.01750071 = queryNorm
              0.45032203 = fieldWeight in 937, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.0948124 = idf(docFreq=711, maxDocs=42740)
                0.0625 = fieldNorm(doc=937)
          0.066871375 = weight(abstract_txt:certain in 937) [ClassicSimilarity], result of:
            0.066871375 = score(doc=937,freq=1.0), product of:
              0.19273292 = queryWeight, product of:
                1.983791 = boost
                5.551423 = idf(docFreq=450, maxDocs=42740)
                0.01750071 = queryNorm
              0.34696394 = fieldWeight in 937, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.551423 = idf(docFreq=450, maxDocs=42740)
                0.0625 = fieldNorm(doc=937)
          0.14921455 = weight(abstract_txt:databases in 937) [ClassicSimilarity], result of:
            0.14921455 = score(doc=937,freq=9.0), product of:
              0.18111432 = queryWeight, product of:
                2.355266 = boost
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.01750071 = queryNorm
              0.82386947 = fieldWeight in 937, product of:
                3.0 = tf(freq=9.0), with freq of:
                  9.0 = termFreq=9.0
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.0625 = fieldNorm(doc=937)
        0.24 = coord(6/25)
    
  3. Egghe, L.: Properties of the n-overlap vector and n-overlap similarity theory (2006) 0.10
    0.099232495 = sum of:
      0.099232495 = product of:
        0.49616247 = sum of:
          0.053000733 = weight(abstract_txt:theory in 1320) [ClassicSimilarity], result of:
            0.053000733 = score(doc=1320,freq=2.0), product of:
              0.13101077 = queryWeight, product of:
                1.6355788 = boost
                4.576989 = idf(docFreq=1194, maxDocs=42740)
                0.01750071 = queryNorm
              0.4045525 = fieldWeight in 1320, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.576989 = idf(docFreq=1194, maxDocs=42740)
                0.0625 = fieldNorm(doc=1320)
          0.010734654 = weight(abstract_txt:that in 1320) [ClassicSimilarity], result of:
            0.010734654 = score(doc=1320,freq=1.0), product of:
              0.07172399 = queryWeight, product of:
                1.7114538 = boost
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.01750071 = queryNorm
              0.14966616 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.0625 = fieldNorm(doc=1320)
          0.066871375 = weight(abstract_txt:certain in 1320) [ClassicSimilarity], result of:
            0.066871375 = score(doc=1320,freq=1.0), product of:
              0.19273292 = queryWeight, product of:
                1.983791 = boost
                5.551423 = idf(docFreq=450, maxDocs=42740)
                0.01750071 = queryNorm
              0.34696394 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.551423 = idf(docFreq=450, maxDocs=42740)
                0.0625 = fieldNorm(doc=1320)
          0.049738184 = weight(abstract_txt:databases in 1320) [ClassicSimilarity], result of:
            0.049738184 = score(doc=1320,freq=1.0), product of:
              0.18111432 = queryWeight, product of:
                2.355266 = boost
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.01750071 = queryNorm
              0.27462316 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.0625 = fieldNorm(doc=1320)
          0.31581753 = weight(abstract_txt:fraction in 1320) [ClassicSimilarity], result of:
            0.31581753 = score(doc=1320,freq=1.0), product of:
              0.6210363 = queryWeight, product of:
                4.3613615 = boost
                8.13653 = idf(docFreq=33, maxDocs=42740)
                0.01750071 = queryNorm
              0.5085331 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.13653 = idf(docFreq=33, maxDocs=42740)
                0.0625 = fieldNorm(doc=1320)
        0.2 = coord(5/25)
    
  4. Montesi, M.; Mackenzie Owen, J.: Revision of author abstracts : how it is carried out by LISA editors (2007) 0.10
    0.097459555 = sum of:
      0.097459555 = product of:
        0.34806985 = sum of:
          0.036130782 = weight(abstract_txt:cases in 2808) [ClassicSimilarity], result of:
            0.036130782 = score(doc=2808,freq=1.0), product of:
              0.101477705 = queryWeight, product of:
                1.0178605 = boost
                5.696744 = idf(docFreq=389, maxDocs=42740)
                0.01750071 = queryNorm
              0.3560465 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.696744 = idf(docFreq=389, maxDocs=42740)
                0.0625 = fieldNorm(doc=2808)
          0.044833 = weight(abstract_txt:exist in 2808) [ClassicSimilarity], result of:
            0.044833 = score(doc=2808,freq=1.0), product of:
              0.11717931 = queryWeight, product of:
                1.0937761 = boost
                6.121627 = idf(docFreq=254, maxDocs=42740)
                0.01750071 = queryNorm
              0.38260168 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.121627 = idf(docFreq=254, maxDocs=42740)
                0.0625 = fieldNorm(doc=2808)
          0.010734654 = weight(abstract_txt:that in 2808) [ClassicSimilarity], result of:
            0.010734654 = score(doc=2808,freq=1.0), product of:
              0.07172399 = queryWeight, product of:
                1.7114538 = boost
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.01750071 = queryNorm
              0.14966616 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.0625 = fieldNorm(doc=2808)
          0.05169063 = weight(abstract_txt:topic in 2808) [ClassicSimilarity], result of:
            0.05169063 = score(doc=2808,freq=1.0), product of:
              0.1623318 = queryWeight, product of:
                1.820622 = boost
                5.0948124 = idf(docFreq=711, maxDocs=42740)
                0.01750071 = queryNorm
              0.31842577 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0948124 = idf(docFreq=711, maxDocs=42740)
                0.0625 = fieldNorm(doc=2808)
          0.066871375 = weight(abstract_txt:certain in 2808) [ClassicSimilarity], result of:
            0.066871375 = score(doc=2808,freq=1.0), product of:
              0.19273292 = queryWeight, product of:
                1.983791 = boost
                5.551423 = idf(docFreq=450, maxDocs=42740)
                0.01750071 = queryNorm
              0.34696394 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.551423 = idf(docFreq=450, maxDocs=42740)
                0.0625 = fieldNorm(doc=2808)
          0.08614906 = weight(abstract_txt:databases in 2808) [ClassicSimilarity], result of:
            0.08614906 = score(doc=2808,freq=3.0), product of:
              0.18111432 = queryWeight, product of:
                2.355266 = boost
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.01750071 = queryNorm
              0.47566125 = fieldWeight in 2808, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.3939705 = idf(docFreq=1434, maxDocs=42740)
                0.0625 = fieldNorm(doc=2808)
          0.05166033 = weight(abstract_txt:literature in 2808) [ClassicSimilarity], result of:
            0.05166033 = score(doc=2808,freq=1.0), product of:
              0.1857509 = queryWeight, product of:
                2.3852234 = boost
                4.4498587 = idf(docFreq=1356, maxDocs=42740)
                0.01750071 = queryNorm
              0.27811617 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.4498587 = idf(docFreq=1356, maxDocs=42740)
                0.0625 = fieldNorm(doc=2808)
        0.28 = coord(7/25)
    
  5. Althouse, B.M.; West, J.D.; Bergstrom, C.T.; Bergstrom, T.: Differences in impact factor across fields and over time (2009) 0.10
    0.09643178 = sum of:
      0.09643178 = product of:
        0.48215887 = sum of:
          0.036130782 = weight(abstract_txt:cases in 4696) [ClassicSimilarity], result of:
            0.036130782 = score(doc=4696,freq=1.0), product of:
              0.101477705 = queryWeight, product of:
                1.0178605 = boost
                5.696744 = idf(docFreq=389, maxDocs=42740)
                0.01750071 = queryNorm
              0.3560465 = fieldWeight in 4696, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.696744 = idf(docFreq=389, maxDocs=42740)
                0.0625 = fieldNorm(doc=4696)
          0.010734654 = weight(abstract_txt:that in 4696) [ClassicSimilarity], result of:
            0.010734654 = score(doc=4696,freq=1.0), product of:
              0.07172399 = queryWeight, product of:
                1.7114538 = boost
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.01750071 = queryNorm
              0.14966616 = fieldWeight in 4696, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.3946586 = idf(docFreq=10595, maxDocs=42740)
                0.0625 = fieldNorm(doc=4696)
          0.046417154 = weight(abstract_txt:find in 4696) [ClassicSimilarity], result of:
            0.046417154 = score(doc=4696,freq=1.0), product of:
              0.1510943 = queryWeight, product of:
                1.7564751 = boost
                4.915304 = idf(docFreq=851, maxDocs=42740)
                0.01750071 = queryNorm
              0.3072065 = fieldWeight in 4696, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.915304 = idf(docFreq=851, maxDocs=42740)
                0.0625 = fieldNorm(doc=4696)
          0.07305873 = weight(abstract_txt:literature in 4696) [ClassicSimilarity], result of:
            0.07305873 = score(doc=4696,freq=2.0), product of:
              0.1857509 = queryWeight, product of:
                2.3852234 = boost
                4.4498587 = idf(docFreq=1356, maxDocs=42740)
                0.01750071 = queryNorm
              0.39331564 = fieldWeight in 4696, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.4498587 = idf(docFreq=1356, maxDocs=42740)
                0.0625 = fieldNorm(doc=4696)
          0.31581753 = weight(abstract_txt:fraction in 4696) [ClassicSimilarity], result of:
            0.31581753 = score(doc=4696,freq=1.0), product of:
              0.6210363 = queryWeight, product of:
                4.3613615 = boost
                8.13653 = idf(docFreq=33, maxDocs=42740)
                0.01750071 = queryNorm
              0.5085331 = fieldWeight in 4696, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.13653 = idf(docFreq=33, maxDocs=42740)
                0.0625 = fieldNorm(doc=4696)
        0.2 = coord(5/25)