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) 4.71
    4.7136316 = sum of:
      4.7136316 = weight(author_txt:egghe in 6883) [ClassicSimilarity], result of:
        4.7136316 = fieldWeight in 6883, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5418105 = idf(docFreq=60, maxDocs=42306)
          0.625 = fieldNorm(doc=6883)
    
  2. Egghe, L.: Expansion of the field of informetrics : the second special issue (2006) 4.71
    4.7136316 = sum of:
      4.7136316 = weight(author_txt:egghe in 7119) [ClassicSimilarity], result of:
        4.7136316 = fieldWeight in 7119, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5418105 = idf(docFreq=60, maxDocs=42306)
          0.625 = fieldNorm(doc=7119)
    
  3. Egghe, L.: Expansion of the field of informetrics : origins and consequences (2005) 4.71
    4.7136316 = sum of:
      4.7136316 = weight(author_txt:egghe in 1979) [ClassicSimilarity], result of:
        4.7136316 = fieldWeight in 1979, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5418105 = idf(docFreq=60, maxDocs=42306)
          0.625 = fieldNorm(doc=1979)
    
  4. Egghe, L.: ¬The amount of actions needed for shelving and reshelving (1996) 4.71
    4.7136316 = sum of:
      4.7136316 = weight(author_txt:egghe in 4463) [ClassicSimilarity], result of:
        4.7136316 = fieldWeight in 4463, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5418105 = idf(docFreq=60, maxDocs=42306)
          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) 4.71
    4.7136316 = sum of:
      4.7136316 = weight(author_txt:egghe in 5137) [ClassicSimilarity], result of:
        4.7136316 = fieldWeight in 5137, product of:
          1.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          7.5418105 = idf(docFreq=60, maxDocs=42306)
          0.625 = fieldNorm(doc=5137)
    

Similar documents (content)

  1. Hood, W.W.; Wilson, C.S.: Overlap in bibliographic databases (2003) 0.12
    0.12493531 = sum of:
      0.12493531 = product of:
        0.4461975 = sum of:
          0.060208354 = weight(abstract_txt:coverage in 2869) [ClassicSimilarity], result of:
            0.060208354 = score(doc=2869,freq=2.0), product of:
              0.113192365 = queryWeight, product of:
                1.0745099 = boost
                6.0178947 = idf(docFreq=279, maxDocs=42306)
                0.017505001 = queryNorm
              0.5319118 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.0178947 = idf(docFreq=279, maxDocs=42306)
                0.0625 = fieldNorm(doc=2869)
          0.037835773 = weight(abstract_txt:theory in 2869) [ClassicSimilarity], result of:
            0.037835773 = score(doc=2869,freq=1.0), product of:
              0.131826 = queryWeight, product of:
                1.6399 = boost
                4.592208 = idf(docFreq=1164, maxDocs=42306)
                0.017505001 = queryNorm
              0.287013 = fieldWeight in 2869, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.592208 = idf(docFreq=1164, maxDocs=42306)
                0.0625 = fieldNorm(doc=2869)
          0.015369153 = weight(abstract_txt:that in 2869) [ClassicSimilarity], result of:
            0.015369153 = score(doc=2869,freq=2.0), product of:
              0.0723046 = queryWeight, product of:
                1.7175714 = boost
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.017505001 = queryNorm
              0.2125612 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.0625 = fieldNorm(doc=2869)
          0.064195804 = weight(abstract_txt:high in 2869) [ClassicSimilarity], result of:
            0.064195804 = score(doc=2869,freq=2.0), product of:
              0.14884254 = queryWeight, product of:
                1.7425305 = boost
                4.879604 = idf(docFreq=873, maxDocs=42306)
                0.017505001 = queryNorm
              0.4313001 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.879604 = idf(docFreq=873, maxDocs=42306)
                0.0625 = fieldNorm(doc=2869)
          0.073485844 = weight(abstract_txt:topic in 2869) [ClassicSimilarity], result of:
            0.073485844 = score(doc=2869,freq=2.0), product of:
              0.1628765 = queryWeight, product of:
                1.8228295 = boost
                5.104465 = idf(docFreq=697, maxDocs=42306)
                0.017505001 = queryNorm
              0.4511752 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.104465 = idf(docFreq=697, maxDocs=42306)
                0.0625 = fieldNorm(doc=2869)
          0.12151311 = weight(abstract_txt:databases in 2869) [ClassicSimilarity], result of:
            0.12151311 = score(doc=2869,freq=6.0), product of:
              0.18077073 = queryWeight, product of:
                2.3519416 = boost
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                0.017505001 = queryNorm
              0.67219466 = fieldWeight in 2869, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                0.0625 = fieldNorm(doc=2869)
          0.07358943 = weight(abstract_txt:literature in 2869) [ClassicSimilarity], result of:
            0.07358943 = score(doc=2869,freq=2.0), product of:
              0.18662223 = queryWeight, product of:
                2.3897042 = boost
                4.461255 = idf(docFreq=1327, maxDocs=42306)
                0.017505001 = queryNorm
              0.39432296 = fieldWeight in 2869, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.461255 = idf(docFreq=1327, maxDocs=42306)
                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
    0.10344031 = sum of:
      0.10344031 = product of:
        0.43100128 = sum of:
          0.08514747 = weight(abstract_txt:coverage in 937) [ClassicSimilarity], result of:
            0.08514747 = score(doc=937,freq=4.0), product of:
              0.113192365 = queryWeight, product of:
                1.0745099 = boost
                6.0178947 = idf(docFreq=279, maxDocs=42306)
                0.017505001 = queryNorm
              0.75223684 = fieldWeight in 937, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                6.0178947 = idf(docFreq=279, maxDocs=42306)
                0.0625 = fieldNorm(doc=937)
          0.010867632 = weight(abstract_txt:that in 937) [ClassicSimilarity], result of:
            0.010867632 = score(doc=937,freq=1.0), product of:
              0.0723046 = queryWeight, product of:
                1.7175714 = boost
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.017505001 = queryNorm
              0.15030347 = fieldWeight in 937, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.0625 = fieldNorm(doc=937)
          0.04539329 = weight(abstract_txt:high in 937) [ClassicSimilarity], result of:
            0.04539329 = score(doc=937,freq=1.0), product of:
              0.14884254 = queryWeight, product of:
                1.7425305 = boost
                4.879604 = idf(docFreq=873, maxDocs=42306)
                0.017505001 = queryNorm
              0.30497524 = fieldWeight in 937, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.879604 = idf(docFreq=873, maxDocs=42306)
                0.0625 = fieldNorm(doc=937)
          0.073485844 = weight(abstract_txt:topic in 937) [ClassicSimilarity], result of:
            0.073485844 = score(doc=937,freq=2.0), product of:
              0.1628765 = queryWeight, product of:
                1.8228295 = boost
                5.104465 = idf(docFreq=697, maxDocs=42306)
                0.017505001 = queryNorm
              0.4511752 = fieldWeight in 937, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.104465 = idf(docFreq=697, maxDocs=42306)
                0.0625 = fieldNorm(doc=937)
          0.06728448 = weight(abstract_txt:certain in 937) [ClassicSimilarity], result of:
            0.06728448 = score(doc=937,freq=1.0), product of:
              0.19349775 = queryWeight, product of:
                1.9868029 = boost
                5.563639 = idf(docFreq=440, maxDocs=42306)
                0.017505001 = queryNorm
              0.34772745 = fieldWeight in 937, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.563639 = idf(docFreq=440, maxDocs=42306)
                0.0625 = fieldNorm(doc=937)
          0.14882258 = weight(abstract_txt:databases in 937) [ClassicSimilarity], result of:
            0.14882258 = score(doc=937,freq=9.0), product of:
              0.18077073 = queryWeight, product of:
                2.3519416 = boost
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                0.017505001 = queryNorm
              0.823267 = fieldWeight in 937, product of:
                3.0 = tf(freq=9.0), with freq of:
                  9.0 = termFreq=9.0
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                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
    0.09915219 = sum of:
      0.09915219 = product of:
        0.49576095 = sum of:
          0.05350787 = weight(abstract_txt:theory in 1320) [ClassicSimilarity], result of:
            0.05350787 = score(doc=1320,freq=2.0), product of:
              0.131826 = queryWeight, product of:
                1.6399 = boost
                4.592208 = idf(docFreq=1164, maxDocs=42306)
                0.017505001 = queryNorm
              0.40589768 = fieldWeight in 1320, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.592208 = idf(docFreq=1164, maxDocs=42306)
                0.0625 = fieldNorm(doc=1320)
          0.010867632 = weight(abstract_txt:that in 1320) [ClassicSimilarity], result of:
            0.010867632 = score(doc=1320,freq=1.0), product of:
              0.0723046 = queryWeight, product of:
                1.7175714 = boost
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.017505001 = queryNorm
              0.15030347 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.0625 = fieldNorm(doc=1320)
          0.06728448 = weight(abstract_txt:certain in 1320) [ClassicSimilarity], result of:
            0.06728448 = score(doc=1320,freq=1.0), product of:
              0.19349775 = queryWeight, product of:
                1.9868029 = boost
                5.563639 = idf(docFreq=440, maxDocs=42306)
                0.017505001 = queryNorm
              0.34772745 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.563639 = idf(docFreq=440, maxDocs=42306)
                0.0625 = fieldNorm(doc=1320)
          0.049607523 = weight(abstract_txt:databases in 1320) [ClassicSimilarity], result of:
            0.049607523 = score(doc=1320,freq=1.0), product of:
              0.18077073 = queryWeight, product of:
                2.3519416 = boost
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                0.017505001 = queryNorm
              0.27442232 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                0.0625 = fieldNorm(doc=1320)
          0.31449345 = weight(abstract_txt:fraction in 1320) [ClassicSimilarity], result of:
            0.31449345 = score(doc=1320,freq=1.0), product of:
              0.6192093 = queryWeight, product of:
                4.3529253 = boost
                8.126324 = idf(docFreq=33, maxDocs=42306)
                0.017505001 = queryNorm
              0.50789523 = fieldWeight in 1320, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.126324 = idf(docFreq=33, maxDocs=42306)
                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
    0.09783906 = sum of:
      0.09783906 = product of:
        0.3494252 = sum of:
          0.036415778 = weight(abstract_txt:cases in 2808) [ClassicSimilarity], result of:
            0.036415778 = score(doc=2808,freq=1.0), product of:
              0.10199582 = queryWeight, product of:
                1.0199832 = boost
                5.712513 = idf(docFreq=379, maxDocs=42306)
                0.017505001 = queryNorm
              0.35703206 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.712513 = idf(docFreq=379, maxDocs=42306)
                0.0625 = fieldNorm(doc=2808)
          0.044936657 = weight(abstract_txt:exist in 2808) [ClassicSimilarity], result of:
            0.044936657 = score(doc=2808,freq=1.0), product of:
              0.11734281 = queryWeight, product of:
                1.0940322 = boost
                6.127231 = idf(docFreq=250, maxDocs=42306)
                0.017505001 = queryNorm
              0.38295195 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.127231 = idf(docFreq=250, maxDocs=42306)
                0.0625 = fieldNorm(doc=2808)
          0.010867632 = weight(abstract_txt:that in 2808) [ClassicSimilarity], result of:
            0.010867632 = score(doc=2808,freq=1.0), product of:
              0.0723046 = queryWeight, product of:
                1.7175714 = boost
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.017505001 = queryNorm
              0.15030347 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.0625 = fieldNorm(doc=2808)
          0.05196234 = weight(abstract_txt:topic in 2808) [ClassicSimilarity], result of:
            0.05196234 = score(doc=2808,freq=1.0), product of:
              0.1628765 = queryWeight, product of:
                1.8228295 = boost
                5.104465 = idf(docFreq=697, maxDocs=42306)
                0.017505001 = queryNorm
              0.31902906 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.104465 = idf(docFreq=697, maxDocs=42306)
                0.0625 = fieldNorm(doc=2808)
          0.06728448 = weight(abstract_txt:certain in 2808) [ClassicSimilarity], result of:
            0.06728448 = score(doc=2808,freq=1.0), product of:
              0.19349775 = queryWeight, product of:
                1.9868029 = boost
                5.563639 = idf(docFreq=440, maxDocs=42306)
                0.017505001 = queryNorm
              0.34772745 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.563639 = idf(docFreq=440, maxDocs=42306)
                0.0625 = fieldNorm(doc=2808)
          0.08592275 = weight(abstract_txt:databases in 2808) [ClassicSimilarity], result of:
            0.08592275 = score(doc=2808,freq=3.0), product of:
              0.18077073 = queryWeight, product of:
                2.3519416 = boost
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                0.017505001 = queryNorm
              0.4753134 = fieldWeight in 2808, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.390757 = idf(docFreq=1424, maxDocs=42306)
                0.0625 = fieldNorm(doc=2808)
          0.052035585 = weight(abstract_txt:literature in 2808) [ClassicSimilarity], result of:
            0.052035585 = score(doc=2808,freq=1.0), product of:
              0.18662223 = queryWeight, product of:
                2.3897042 = boost
                4.461255 = idf(docFreq=1327, maxDocs=42306)
                0.017505001 = queryNorm
              0.27882844 = fieldWeight in 2808, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.461255 = idf(docFreq=1327, maxDocs=42306)
                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
    0.096381955 = sum of:
      0.096381955 = product of:
        0.48190975 = sum of:
          0.036415778 = weight(abstract_txt:cases in 515) [ClassicSimilarity], result of:
            0.036415778 = score(doc=515,freq=1.0), product of:
              0.10199582 = queryWeight, product of:
                1.0199832 = boost
                5.712513 = idf(docFreq=379, maxDocs=42306)
                0.017505001 = queryNorm
              0.35703206 = fieldWeight in 515, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.712513 = idf(docFreq=379, maxDocs=42306)
                0.0625 = fieldNorm(doc=515)
          0.010867632 = weight(abstract_txt:that in 515) [ClassicSimilarity], result of:
            0.010867632 = score(doc=515,freq=1.0), product of:
              0.0723046 = queryWeight, product of:
                1.7175714 = boost
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.017505001 = queryNorm
              0.15030347 = fieldWeight in 515, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4048555 = idf(docFreq=10381, maxDocs=42306)
                0.0625 = fieldNorm(doc=515)
          0.04654346 = weight(abstract_txt:find in 515) [ClassicSimilarity], result of:
            0.04654346 = score(doc=515,freq=1.0), product of:
              0.15134628 = queryWeight, product of:
                1.7571253 = boost
                4.9204736 = idf(docFreq=838, maxDocs=42306)
                0.017505001 = queryNorm
              0.3075296 = fieldWeight in 515, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.9204736 = idf(docFreq=838, maxDocs=42306)
                0.0625 = fieldNorm(doc=515)
          0.07358943 = weight(abstract_txt:literature in 515) [ClassicSimilarity], result of:
            0.07358943 = score(doc=515,freq=2.0), product of:
              0.18662223 = queryWeight, product of:
                2.3897042 = boost
                4.461255 = idf(docFreq=1327, maxDocs=42306)
                0.017505001 = queryNorm
              0.39432296 = fieldWeight in 515, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.461255 = idf(docFreq=1327, maxDocs=42306)
                0.0625 = fieldNorm(doc=515)
          0.31449345 = weight(abstract_txt:fraction in 515) [ClassicSimilarity], result of:
            0.31449345 = score(doc=515,freq=1.0), product of:
              0.6192093 = queryWeight, product of:
                4.3529253 = boost
                8.126324 = idf(docFreq=33, maxDocs=42306)
                0.017505001 = queryNorm
              0.50789523 = fieldWeight in 515, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.126324 = idf(docFreq=33, maxDocs=42306)
                0.0625 = fieldNorm(doc=515)
        0.2 = coord(5/25)