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Table 2 Some national referral network measures in 2006-2011

From: Referral paths in the U.S. physician network

Year 2006 2007 2008 2009 2010 2011
# nodes 272353 296008 313051 323042 334452 347586
# edges 5708791 5948185 6313136 6544847 6785594 7047586
Exponent of indegree power law 3.08 2.80 1.55 2.76 1.54 2.74
p-value of indegree power law test 0.97 0.89 0.21 0.85 0.22 0.82
Exponent of outdegree power law 3.01 2.69 2.71 2.66 2.56 2.68
p-value of outdegree power law test 0.9 0.94 0.93 0.96 0.91 0.93
Size of the largest connected component 271898 295405 312412 322452 333727 346711
(in, in) degree assortativity -0.094 -0.088 -0.084 -0.085 -0.083 -0.084
Self in/out degree correlation 0.983 0.982 0.983 0.983 0.983 0.984
Reciprocity of #referral 0.878 0.890 0.896 0.901 0.902 0.896