PageRank values of the clusters from 2011 to 2015_
| 2011 | 2012 | 2013 | 2014 | 2015 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Clusters | PR | Clusters | PR | Clusters | PR | Clusters | PR | Clusters | PR | |
| 1 | #INDUSTRY | 11.0% | #PATENT CITATIONS | 8.7% | #TERMS | 7.4% | #INNOVATION | 7.2% | #FREQUENCY | 7.3% |
| 2 | #GOOGLE SCHOLAR | 10.0% | #TRIPLE HELIX | 7.3% | #CITATION NETWORKS | 7.3% | #PUBLISHERS | 5.8% | #SEX DIFFERENCES | 7.3% |
| 3 | #ITALY | 8.2% | #SCOPUS | 6.9% | #SCALES | 6.8% | #PERCENTILES | 5.6% | #SOCIAL NETWORKS | 5.8% |
| 4 | #INDICATORS | 8.2% | #ACADEMIC WEB | 6.8% | #COOPERATION | 6.4% | #WEBOMETRICS | 5.4% | #CHINA | 5.4% |
| 5 | #INTERNATIONAL COLLABORATION | 7.5% | #SCIENCE | 6.2% | #SCIENCE | 5.5% | #INFORMATION SCIENCE | 5.4% | #INFORMATION SCIENCE | 5.2% |
| 6 | #H-INDEX | 6.8% | #CLASSIFICATION | 5.9% | #RESEARCH PRODUCTIVITY | 5.4% | 5.0% | 5.1% | ||
| 7 | #RESEARCH PERFORMANCE | 6.5% | #SCIENTIFIC COLLABORATION | 5.1% | #INNOVATION | 5.3% | #ITALY | 4.7% | #CO-WORD ANALYSIS | 5.0% |
| 8 | #RESEARCHERS | 6.1% | #MANAGEMENT | 5.0% | #RESEARCH PERFORMANCE | 5.0% | #RANKING | 4.7% | #H-INDEX | 5.0% |
| 9 | #CO-WORD ANALYSIS | 4.5% | #PROXIMITY | 4.7% | #MAPS | 4.7% | #SCIENTIFIC PRODUCTIVITY | 4.5% | #SCOPUS | 4.7% |
| 10 | #SOCIAL SCIENCES | 4.4% | #LIBRARY | 4.7% | #SCOPUS | 4.6% | #INTERDISCIPLINARY | 4.5% | #SELF-ORGANIZATION | 4.6% |
| 11 | #CO-AUTHORSHIP NETWORK | 4.2% | #COOPERATION | 4.7% | #KNOWLEDGE | 4.6% | #SOCIOLOGY | 4.3% | #INN OVATION | 4.6% |
| 12 | #RESEARCH COLLABORATION | 3.9% | #INDEX | 4.4% | #CO-AUTHORSHIP NETWORK | 4.6% | #PATTERNS | 4.1% | #CO-AUTHORSHIP | 4.6% |
| 13 | #BIOTECHNOLOGY | 3.7% | #NANOTECHNOLOGY | 4.2% | #H-INDEX | 4.3% | #CO-AUTHORSHIP | 4.0% | #SCIENCE | 4.5% |
| 14 | #WORD ANALYSIS | 3.4% | #DIFFUSION | 4.1% | #KNOWLEDGE MANAGEMENT | 4.2% | #NANOSCIENCE | 3.9% | #ITALY | 4.2% |
| 15 | #INFORMATION SCIENCE | 3.2% | #SOCIAL NETWORK ANALYSIS | 4.0% | #CLASSIFIC ATION | 4.0% | #TRIPLE HELIX | 3.6% | #DEPARTMENTS | 3.9% |