Skip to main content

Table 2 Network descriptive statistics for migration flows, 1990–2015 (binarized data)

From: Global dynamics of international migration systems across South–South, North–North, and North–South flows, 1990–2015

  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)
  1. Migration flows included here are those in the top quartile of flows arranged by size in each migration network