Search (11 results, page 1 of 1)

  • × theme_ss:"Informetrie"
  • × year_i:[2020 TO 2030}
  1. Delgado-Quirós, L.; Aguillo, I.F.; Martín-Martín, A.; López-Cózar, E.D.; Orduña-Malea, E.; Ortega, J.L.: Why are these publications missing? : uncovering the reasons behind the exclusion of documents in free-access scholarly databases (2024) 0.01 
    0.01321952 = product of:
  0.0660976 = sum of:
    0.0660976 = weight(_text_:books in 1201) [ClassicSimilarity], result of:
      0.0660976 = score(doc=1201,freq=2.0), product of:
        0.24756333 = queryWeight, product of:
          4.8330836 = idf(docFreq=956, maxDocs=44218)
          0.051222645 = queryNorm
        0.2669927 = fieldWeight in 1201, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.8330836 = idf(docFreq=956, maxDocs=44218)
          0.0390625 = fieldNorm(doc=1201)
  0.2 = coord(1/5)
    Abstract
    This study analyses the coverage of seven free-access bibliographic databases (Crossref, Dimensions-non-subscription version, Google Scholar, Lens, Microsoft Academic, Scilit, and Semantic Scholar) to identify the potential reasons that might cause the exclusion of scholarly documents and how they could influence coverage. To do this, 116 k randomly selected bibliographic records from Crossref were used as a baseline. API endpoints and web scraping were used to query each database. The results show that coverage differences are mainly caused by the way each service builds their databases. While classic bibliographic databases ingest almost the exact same content from Crossref (Lens and Scilit miss 0.1% and 0.2% of the records, respectively), academic search engines present lower coverage (Google Scholar does not find: 9.8%, Semantic Scholar: 10%, and Microsoft Academic: 12%). Coverage differences are mainly attributed to external factors, such as web accessibility and robot exclusion policies (39.2%-46%), and internal requirements that exclude secondary content (6.5%-11.6%). In the case of Dimensions, the only classic bibliographic database with the lowest coverage (7.6%), internal selection criteria such as the indexation of full books instead of book chapters (65%) and the exclusion of secondary content (15%) are the main motives of missing publications.
  2. Manley, S.: Letters to the editor and the race for publication metrics (2022) 0.01 
    0.009715946 = product of:
  0.04857973 = sum of:
    0.04857973 = weight(_text_:22 in 547) [ClassicSimilarity], result of:
      0.04857973 = score(doc=547,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.2708308 = fieldWeight in 547, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0546875 = fieldNorm(doc=547)
  0.2 = coord(1/5)
    Date
    6. 4.2022 19:22:26
  3. Lorentzen, D.G.: Bridging polarised Twitter discussions : the interactions of the users in the middle (2021) 0.01 
    0.0083279535 = product of:
  0.041639768 = sum of:
    0.041639768 = weight(_text_:22 in 182) [ClassicSimilarity], result of:
      0.041639768 = score(doc=182,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.23214069 = fieldWeight in 182, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.046875 = fieldNorm(doc=182)
  0.2 = coord(1/5)
    Date
    20. 1.2015 18:30:22
  4. Milard, B.; Pitarch, Y.: Egocentric cocitation networks and scientific papers destinies (2023) 0.01 
    0.0083279535 = product of:
  0.041639768 = sum of:
    0.041639768 = weight(_text_:22 in 918) [ClassicSimilarity], result of:
      0.041639768 = score(doc=918,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.23214069 = fieldWeight in 918, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.046875 = fieldNorm(doc=918)
  0.2 = coord(1/5)
    Date
    21. 3.2023 19:22:14
  5. Thelwall, M.; Thelwall, S.: ¬A thematic analysis of highly retweeted early COVID-19 tweets : consensus, information, dissent and lockdown life (2020) 0.01 
    0.006939962 = product of:
  0.03469981 = sum of:
    0.03469981 = weight(_text_:22 in 178) [ClassicSimilarity], result of:
      0.03469981 = score(doc=178,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.19345059 = fieldWeight in 178, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0390625 = fieldNorm(doc=178)
  0.2 = coord(1/5)
    Date
    20. 1.2015 18:30:22
  6. Wang, S.; Ma, Y.; Mao, J.; Bai, Y.; Liang, Z.; Li, G.: Quantifying scientific breakthroughs by a novel disruption indicator based on knowledge entities : On the rise of scrape-and-report scholarship in online reviews research (2023) 0.01 
    0.006939962 = product of:
  0.03469981 = sum of:
    0.03469981 = weight(_text_:22 in 882) [ClassicSimilarity], result of:
      0.03469981 = score(doc=882,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.19345059 = fieldWeight in 882, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0390625 = fieldNorm(doc=882)
  0.2 = coord(1/5)
    Date
    22. 1.2023 18:37:33
  7. Cerda-Cosme, R.; Méndez, E.: Analysis of shared research data in Spanish scientific papers about COVID-19 : a first approach (2023) 0.01 
    0.006939962 = product of:
  0.03469981 = sum of:
    0.03469981 = weight(_text_:22 in 916) [ClassicSimilarity], result of:
      0.03469981 = score(doc=916,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.19345059 = fieldWeight in 916, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0390625 = fieldNorm(doc=916)
  0.2 = coord(1/5)
    Date
    21. 3.2023 19:22:02
  8. Asubiaro, T.V.; Onaolapo, S.: ¬A comparative study of the coverage of African journals in Web of Science, Scopus, and CrossRef (2023) 0.01 
    0.006939962 = product of:
  0.03469981 = sum of:
    0.03469981 = weight(_text_:22 in 992) [ClassicSimilarity], result of:
      0.03469981 = score(doc=992,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.19345059 = fieldWeight in 992, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0390625 = fieldNorm(doc=992)
  0.2 = coord(1/5)
    Date
    22. 6.2023 14:09:06
  9. Zhang, Y.; Wu, M.; Zhang, G.; Lu, J.: Stepping beyond your comfort zone : diffusion-based network analytics for knowledge trajectory recommendation (2023) 0.01 
    0.006939962 = product of:
  0.03469981 = sum of:
    0.03469981 = weight(_text_:22 in 994) [ClassicSimilarity], result of:
      0.03469981 = score(doc=994,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.19345059 = fieldWeight in 994, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0390625 = fieldNorm(doc=994)
  0.2 = coord(1/5)
    Date
    22. 6.2023 18:07:12
  10. Thelwall, M.; Kousha, K.; Abdoli, M.; Stuart, E.; Makita, M.; Wilson, P.; Levitt, J.: Why are coauthored academic articles more cited : higher quality or larger audience? (2023) 0.01 
    0.006939962 = product of:
  0.03469981 = sum of:
    0.03469981 = weight(_text_:22 in 995) [ClassicSimilarity], result of:
      0.03469981 = score(doc=995,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.19345059 = fieldWeight in 995, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0390625 = fieldNorm(doc=995)
  0.2 = coord(1/5)
    Date
    22. 6.2023 18:11:50
  11. Vakkari, P.; Järvelin, K.; Chang, Y.-W.: ¬The association of disciplinary background with the evolution of topics and methods in Library and Information Science research 1995-2015 (2023) 0.01 
    0.006939962 = product of:
  0.03469981 = sum of:
    0.03469981 = weight(_text_:22 in 998) [ClassicSimilarity], result of:
      0.03469981 = score(doc=998,freq=2.0), product of:
        0.17937298 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051222645 = queryNorm
        0.19345059 = fieldWeight in 998, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0390625 = fieldNorm(doc=998)
  0.2 = coord(1/5)
    Date
    22. 6.2023 18:15:06

Authors