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. 2013 Apr 3;8(4):e59814. doi: 10.1371/journal.pone.0059814

Figure 2. The relative contribution of co-authors.

Figure 2

Among the University Medical Centre researchers (n = 161), there was a non-significant trend for the association between the p-index and the h-index (ρ = +0.15, p = 0.067), while the ph-index and the h-index were only weakly associated (ρ = +0.17, p = 0.031), suggesting that the relative contribution of co-authors to the work of an author is relatively stable over his/her scientific career.