Search (1 results, page 1 of 1)

  • × author_ss:"Davis, P.M."
  • × theme_ss:"Informetrie"
  1. Davis, P.M.: Author-choice open-access publishing in the biological and medical literature : a citation analysis (2009) 0.02
    0.024941966 = product of:
      0.049883932 = sum of:
        0.049883932 = product of:
          0.099767864 = sum of:
            0.099767864 = weight(_text_:2007 in 2622) [ClassicSimilarity], result of:
              0.099767864 = score(doc=2622,freq=4.0), product of:
                0.20205033 = queryWeight, product of:
                  4.514535 = idf(docFreq=1315, maxDocs=44218)
                  0.044755515 = queryNorm
                0.49377728 = fieldWeight in 2622, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  4.514535 = idf(docFreq=1315, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=2622)
          0.5 = coord(1/2)
      0.5 = coord(1/2)
    
    Abstract
    In this article, we analyze the citations to articles published in 11 biological and medical journals from 2003 to 2007 that employ author-choice open-access models. Controlling for known explanatory predictors of citations, only 2 of the 11 journals show positive and significant open-access effects. Analyzing all journals together, we report a small but significant increase in article citations of 17%. In addition, there is strong evidence to suggest that the open-access advantage is declining by about 7% per year, from 32% in 2004 to 11% in 2007.