A study of physician collaborations through social network and exponential random graph

Table 3 Linear regression models between each of network attributes (i.e. degree centralisation , betweenness centralisation and density ) of PCN and hospital performance measures (i.e. hospitalisation cost and readmission rate )

Model	Dependent variable	Independent variable	R²value	β	Constant	Significance
1	Hospitalisation cost	Degree centralisation	0.012	5906.42	19545.39	0.309
2	Readmission rate	Degree centralisation	0.139	−37.87	45.48	0.003
3	Hospitalisation cost	Betweenness centralisation	0.107	−12384.79	27101.96	0.015
4	Readmission rate	Betweenness centralisation	0.112	−25.18	18.19	0.010
5	Hospitalisation cost	Density	0.118	17310.51	19635.69	0.009
6	Readmission rate	Density	0.196	49.08	3.427	0.000

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