Table 2 Network descriptive statistics for migration flows, 1990–2015 (binarized data)
1990–1995 | 1995–2000 | 2000–2005 | 2005–2010 | 2010–2015 | |
|---|---|---|---|---|---|
North–North flows | |||||
Density | 0.248 | 0.248 | 0.248 | 0.249 | 0.249 |
Centralization (indegree) | 0.640 | 0.619 | 0.597 | 0.533 | 0.533 |
Mean in-degree (std. dev) | 11.92 (10.22) | 11.99 (9.81) | 11.92 (9.99) | 11.94 (8.95) | 11.96 (9.22) |
Mean out-degree (std. dev) | 11.92 (7.83) | 11.90 (8.84) | 11.92 (9.28) | 11.94 (9.74) | 11.96 (9.38) |
Number of nodes | 49 | 49 | 49 | 49 | 49 |
Number of isolates | 0 | 1 | 2 | 1 | 0 |
Dyad census | |||||
Number of mutual dyads | 219 | 223 | 233 | 233 | 246 |
Number of asymmetric dyads | 146 | 137 | 118 | 119 | 94 |
Number of null dyads | 811 | 816 | 825 | 824 | 836 |
Relevant triads | |||||
Number of transitive triads (030T) | 39 | 42 | 28 | 36 | 22 |
Number of 021U triads | 283 | 209 | 213 | 89 | 95 |
Number of cyclic triangles (030C) | 0 | 0 | 1 | 0 | 0 |
Number of 021C triads | 150 | 181 | 120 | 136 | 74 |
Number of trans. rec. triads (120C) | 37 | 39 | 42 | 38 | 34 |
South–South flows | |||||
Density | 0.265 | 0.264 | 0.258 | 0.268 | 0.254 |
Centralization (indegree) | 0.627 | 0.486 | 0.634 | 0.647 | 0.594 |
Mean in-degree (std. dev) | 35.57 (22.02) | 35.34 (22.46) | 34.63 (21.69) | 35.98 (22.16) | 34 (21.98) |
Mean out-degree (std. dev) | 35.57 (22.23) | 35.34 (21.48) | 34.63 (20.37) | 35.98 (21.85) | 34 (20.82) |
Number of nodes | 135 | 135 | 135 | 135 | 135 |
Number of isolates | 0 | 0 | 0 | 0 | 0 |
Dyad census | |||||
Number of mutual dyads | 1760 | 1794 | 1819 | 1872 | 1952 |
Number of asymmetric dyads | 1282 | 1183 | 1037 | 1113 | 686 |
Number of null dyads | 6003 | 6068 | 6189 | 6060 | 6407 |
Relevant triads | |||||
Number of transitive triads (030T) | 2049 | 1345 | 1232 | 1490 | 322 |
Number of 021U triads | 5863 | 6758 | 5890 | 5209 | 3738 |
Number of cyclic triangles (030C) | 21 | 5 | 8 | 7 | 0 |
Number of 021C triads | 2937 | 2250 | 2072 | 1739 | 412 |
Number of trans. rec. triads (120C) | 1114 | 946 | 949 | 927 | 439 |
North–South flows | |||||
Density | 0.098 | 0.098 | 0.098 | 0.097 | 0.097 |
Centralization (indegree) | 0.517 | 0.561 | 0.528 | 0.539 | 0.523 |
Mean in-degree (std. dev) | 17.86 (21.23) | 17.87 (23.32) | 17.85 (23.25) | 17.83 (22.32) | 17.83 (22.51) |
Mean out-degree (std. dev) | 17.86 (18.42) | 17.87 (17.15) | 17.85 (17.50) | 17.83 (18.37) | 17.83 (18.21) |
Number of nodes | 184 | 184 | 184 | 184 | 184 |
Number of isolates | 1 | 1 | 2 | 0 | 1 |
Dyad census | |||||
Number of mutual dyads | 1200 | 1202 | 1222 | 1260 | 1322 |
Number of asymmetric dyads | 887 | 884 | 840 | 760 | 637 |
Number of null dyads | 14,749 | 14,750 | 14,774 | 14,816 | 14,877 |
Relevant triads | |||||
Number of transitive triads (030T) | – | – | – | – | – |
Number of 021U triads | 6958 | 10,661 | 9330 | 6595 | 5714 |
Number of cyclic triangles (030C) | – | – | – | – | – |
Number of 021C triads | 4129 | 2439 | 1818 | 1782 | 980 |
Number of trans. rec. triads (120C) | – | – | – | – | – |