Skip to main content
. 2009 Jun 29;4(6):e6022. doi: 10.1371/journal.pone.0006022

Table 1. Measure loadings after varimax rotation of first 2 components of PCA analysis of measure correlations (Spearman rank-order).

ID Type Measure Source Network parameters PC1 PC2 Inline graphic
1 Citation Scimago Journal Rank Scimago/Scopus −0.974 −8.296 0.556*
2 Citation Immediacy Index JCR 2007 1.659 −7.046 0.508*
3 Citation Closeness Centrality JCR 2007 Undirected, weighted 0.339 −6.284 0.565*
4 Citaton Cites per doc Scimago/Scopus −1.311 −6.192 0.588*
5 Citation Journal Impact Factor JCR 2007 −1.854 −5.937 0.592*
6 Citation Closeness centrality JCR 2007 Undirected, unweighted −1.388 −4.827 0.619
7 Citation Out-degree centrality JCR 2007 Directed, weighted −3.191 −4.215 0.642
8 Citation Out-degree centrality JCR 2007 Directed, unweighted −2.703 −4.015 0.640
9 Citation Degree Centrality JCR 2007 Undirected, weighted −4.850 −2.834 0.690
10 Citation Degree Centrality JCR 2007 Undirected, unweighted −4.398 −2.643 0.691
11 Citation H-Index Scimago/Scopus −3.326 −2.003 0.681
12 Citation Scimago Total cites Scimago/Scopus −4.926 −1.722 0.712
13 Citation Journal Cite Probability JCR 2007 −5.389 −1.647 0.710
14 Citation In-degree centrality JCR 2007 Directed, unweighted −5.302 −1.429 0.717
15 Citation In-degree centrality JCR 2007 Directed, weighted −5.380 −1.554 0.712
16 Citation PageRank JCR 2007 Directed, unweighted −4.476 0.108 0.693
17 Citation PageRank JCR 2007 Undirected, unweighted −4.929 0.731 0.726
18 Citation PageRank JCR 2007 Undirected, weighted −4.160 0.864 0.696
19 Citation PageRank JCR 2007 Directed, weighted −3.103 0.333 0.659
20 Citation Y-factor JCR 2007 Directed, weighted −2.971 0.317 0.657
21 Citation Betweenness centrality JCR 2007 Undirected, weighted −0.462 0.872 0.643
22 Citation Betweenness centrality JCR 2007 Undirected, unweighted −0.474 1.609 0.642
23 Citation Citation Half-Life JCR 2007 / / 0.037
24 Usage Closeness centrality MESUR 2007 Undirected, weighted 3.130 2.683 0.703
25 Usage Closeness centrality MESUR 2007 Undirected, unweighted 3.100 3.899 0.731
26 Usage Degree centrality MESUR 2007 Undirected, unweighted 3.271 3.873 0.729
27 Usage PageRank MESUR 2007 Undirected, unweighted 3.327 4.192 0.728
28 Usage PageRank MESUR 2007 Directed, unweighted 3.463 4.336 0.727
29 Usage In-degree centrality MESUR 2007 Directed, unweighted 3.463 4.015 0.728
30 Usage Out-degree centrality MESUR 2007 Directed, unweighted 3.484 3.994 0.727
31 Usage PageRank MESUR 2007 Directed, weighted 3.780 4.217 0.710
32 Usage PageRank MESUR 2007 Undirected, weighted 3.813 4.223 0.710
33 Usage Betweenness centrality MESUR 2007 Undirected, unweighted 3.988 4.271 0.699
34 Usage Betweenness centrality MESUR 2007 Undirected, weighted 3.957 3.698 0.693
35 Usage Degree centrality MESUR 2007 Undirected, weighted 5.293 3.528 0.683
36 Usage Out-degree centrality MESUR 2007 Directed, weighted 5.302 3.518 0.683
37 Usage In-degree centrality MESUR 2007 Directed, weighted 5.286 3.531 0.683
38 Usage Journal Use Probability MESUR 2007 8.914 1.833 0.593
39 Usage Usage Impact Factor MESUR 2007 / / 0.279

Average Spearman rank-order correlations to all other measures are listed under Inline graphic (five lowest values indicated by *).