|
Bibliometric statistics and network measures in three centers |
||||
| DDRC |
EMRC |
PSRC |
pvalue |
|
|
|
||||
| Total papers |
48 |
50 |
54 |
- |
| Total authors (size of network) |
39 |
33 |
36 |
- |
| Papers per author (median(IQ range)) |
4(4) |
4(4) |
2(2.75) |
P = 0.006 |
| Maximum papers per author |
42 |
43 |
22 |
- |
| Mean authors per paper |
5(3) |
4(2.2) |
2.7(1.3) |
p < 0.0001 |
| Maximum authors per paper |
12 |
11 |
6 |
- |
|
|
||||
| Co-authorship network |
||||
|
|
||||
| Average co-authorship (median(IQ range)) |
23(35) |
18(15) |
6.5(7.5) |
p < 0.0001 |
| Collaborators per author (median(IQ range)) |
14(9) |
10(7.5) |
5(3) |
p < 0.0001 |
|
|
||||
| Network centralization |
||||
|
|
||||
| Degree centralization |
61.5% |
63.8% |
50.6% |
- |
| Betweenness centralization |
15.6% |
27.7% |
57.2% |
- |
|
|
||||
| Small world phenomenon |
||||
|
|
||||
| Average density |
.417 |
.369 |
.151 |
- |
| Clustering coefficient |
.729 |
.717 |
.735 |
- |
| Mean geodesic distance |
1.6 |
1.6 |
2.3 |
- |
|
|
||||
| Outsiders |
||||
|
|
||||
| Outsiders per author (median(IQ range)) |
21(26) |
6(10) |
5.5(5) |
p < 0.0001 |
| Spearman's correlation of inside and outside collaborations |
0.8(p < 0.001) |
0.49(p < 0.001) |
0.32(p > 0.05) |
- |
Yousefi-Nooraie et al. Health Research Policy and Systems 2008 6:9 doi:10.1186/1478-4505-6-9 |
||||