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Relationship between impact factor and the distribution of citations to articles in a journal The proportion of articles which accounted for 50% of all journal citations is compared with impact factor (log scale) for immunology (a) and surgical (b) journals. There were significant correlations. For immunology journals (n = 105), Spearman Rank correlation rho = 0.463 p < 0.0001. For surgical journals (n = 120), Spearman Rank correlation rho = 0.556 p < 0.0001.
