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Self-Selected or Mandated, Open Access Increases Citation Impact for Higher Quality Research

Figure 3

Distribution of citation counts (minus self-citations) for articles.

Citation counts are not normally distributed. Of our sample of 27,197 articles, 23% had zero citations; 51% had 1–5 citations; 12% had 6–10 citations; 8% had 11–20 citations; and 6% had 20+ citations. It is for this reason that a logistic analysis rather than an ordinary regression analysis was conducted. (Cf. Figure 4, which presents the distribution of average Journal Impact Factors – which are, roughly, average citation counts – for journals.)

Figure 3