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Table 2 Social network parameters and their definitions

From: Structuring successful collaboration: a longitudinal social network analysis of a translational research network

Term Whole network or individual? Definition
Node Both A node is a member of a network
Tie Both A tie represents a self-reported link between two nodes
Density Whole network The number of actual ties divided by the number of possible ties. Reported as a percentage
Reciprocity Whole network The extent to which ties between any two nodes is acknowledged by both. If there is full agreement across the network then reciprocity = 1.0; no agreement = 0.0
Clustering Whole network The extent to which nodes are grouped by an attribute
E-I Index Whole network External-internal index looks at actual ties versus expected ties relating to a certain attribute. It compares ties to members within that group (internal) to those outside (external) that group. Results are between −1.0 and +1.0 and have a p value
Degree Both Number of ties per node (either nominated by others or by the member themselves)
Indegree Individuals Number of ties reported by others directed to the focal member
Outdegree Individuals Number of ties reported by the focal member
Centrality Individuals Members with the highest interaction (ties to and from) with others
Betweenness centrality Individuals Members who have brokerage potential as they lie on the shortest path between two nodes that are not directly linked