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Table 7 Comparison of average common connected nodes between neighbors on a referral path and the expectation in a random network with the same size
| Year | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
|---|---|---|---|---|---|---|
| Random network | 3.60E−03 | 3.10E−03 | 3.00E−03 | 2.90E−03 | 2.80E−03 | 2.80E−03 |
| Referral network | 25.13 | 24.64 | 24.95 | 24.97 | 24.95 | 24.96 |
