Exploring the networking behaviors of hospital organizations

Table 6 Parameter estimates predicting the dynamics of collaborative interdependences

	Estimate	Standard Error	p-value
Independent variables
N° common specialties	−0.405	0.147	0.048	*
Case-mix (alter)	−0.891	0.413	0.584
Case-mix (ego)	0.866	0.452	0.612
Case-mix (similarity)	−0.921	0.647	0.039	*
LHA	1.330	0.154	< 0.000	**
Staffed beds (alter)	0.002	0.001	0.002	**
Staffed beds (ego)	0.001	0.001	0.163
Staffed beds (similarity)	−0.228	0.546	0.376
Geographical distance	−0.013	0.003	< 0.000	**
Productivity (alter)	0.004	0.004	0.842
Productivity (ego)	−0.003	0.004	0.772
Productivity (similarity)	1.704	0.699	0.061
Emergency admissions (alter)	0.005	0.003	0.824
Emergency admissions (ego)	0.018	0.003	0.072
Emergency admissions (similarity)	0.902	0.256	0.050	*
Endogenous processes
Outdegree	−2.576	0.177	< 0.000	**
Reciprocity	0.717	0.205	< 0.000	**
Transitive ties	0.771	0.234	0.006	**
Three-cycles	−0.164	0.097	0.583
Balance	0.072	0.052	0.251
Indegree-popularity	0.029	0.027	0.121
Outdegree-activity	−0.126	0.074	0.341

*p < 0.05; **p < 0.01. P-values are based on approximately normal distributions of t-ratios (defined as the parameter estimate divided by the standard error)

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