Table 6 Global statistical properties of the insider network calculated on January 1st in a corresponding year t. The years were selected in order to illustrate network properties over the whole span of the SRD data as well as SIRE insider trade data set collection periods (see Fig. 1). Here, \(N_{t}\) denotes the number of nodes, \(N_{\text{MATCHED}, t}\) – number of matched insiders, \(N_{\text{MATCHED}, t} /N_{t}\) – ratio of matched insiders to all insiders in the network, \(L_{t}\) – number of links, \(\langle k_{t} \rangle \) – average degree, \(\langle k_{t} \rangle /N_{t}\) – normalized average degree \(N_{t}\), \(N_{c,t}\) – number of nodes in the maximal connected component, \(N_{c,t}/N_{t}\) – fraction of nodes belonging to the maximal connected component
From: Trade synchronization and social ties in stock markets
t | 1995 | 2000 | 2003 | 2005 | 2008 | 2010 | 2013 | 2015 | 2016 |
|---|---|---|---|---|---|---|---|---|---|
\(N_{t}\) | 1791 | 2838 | 3225 | 3410 | 3621 | 3515 | 3576 | 3458 | 3462 |
\(N_{\text{MATCHED}, t}\) | 189 | 407 | 616 | 752 | 1168 | 1257 | 1436 | 1516 | 1479 |
\(N_{\text{MATCHED}, t} /N_{t}\) | 0.11 | 0.14 | 0.19 | 0.22 | 0.32 | 0.36 | 0.40 | 0.44 | 0.43 |
\(L_{t}\) | 54,079 | 160,500 | 200,447 | 224,317 | 173,952 | 138,267 | 114,347 | 86,332 | 86,261 |
\(\langle k_{t} \rangle \) | 60.39 | 113.11 | 124.31 | 131.56 | 96.08 | 78.67 | 63.95 | 49.93 | 49.83 |
\(\langle k_{t} \rangle /N_{t}\) | 0.03 | 0.04 | 0.04 | 0.04 | 0.03 | 0.02 | 0.02 | 0.01 | 0.01 |
\(N_{c,t}\) | 1436 | 2725 | 3124 | 3137 | 3461 | 3415 | 3435 | 3256 | 3155 |
\(N_{c,t}/N_{t}\) | 0.80 | 0.96 | 0.97 | 0.92 | 0.96 | 0.97 | 0.96 | 0.94 | 0.91 |