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Social Network & Search Rankings

Updated: 4/9/2006

http://en.wikipedia.org/wiki/Social_networking

Indices for Social Network Analysis

Betweenness 
  • Degree an individual lies between other individuals in the network; the extent to which a node is directly connected only to those other nodes that are not directly connected to each other; an intermediary; liaisons; bridges. Therefore, it's the number of people who a person is connected to indirectly through their direct links. see also Betweenness
Closeness  
  • The degree an individual is near all other individuals in a network (directly or indirectly). It reflects the ability to access information through the "grapevine" of network members. Thus, closeness is the inverse of the sum of the shortest distances between each individual and every other person in the network. see also Closeness
Degree 
  • The count of the number of ties to other actors in the network.
Eigenvector Centrality 
  • Eigenvector centrality is a measure of the importance of a node in a network. It assigns relative scores to all nodes in the network based on the principle that connections to nodes having a high score contribute more to the score of the node in question.
Clustering Coefficient 
  • A measure of the likelihood that two associates of a node are associates themselves. A higher clustering coefficient indicates a greater 'cliquishness'.
Cohesion 
  • Refers to the degree to which actors are connected directly to each other by cohesive bonds. Groups are identified as ‘cliques’ if every actor is directly tied to every other actor, or ‘social circles’ if there is less stringency of direct contact
Constraint 
Contagion 
Density 
  • Individual-level density is the degree a respondents ties know one another/ proportion of ties among an individual's nominees. Network or global-level density is the proportion of ties in a network relative to the total number possible (sparse versus dense networks).
Integration 
Group degree centralisation
  • A measure of group dispersion or how network links focus on a specific node or nodes.
Radiality 
  • Degree an individual’s network reaches out into the network and provides novel information and influence
Reach 
  • The degree any member of a network can reach other members of the network
Structural Equivalence 
  • Refers to the extent to which actors have a common set of linkages to other actors in the system. The actors don’t need to have any ties to each other to be structurally equivalent.
Structural Hole 
  • Static holes that can be strategically filled by connecting one or more links to link together other points. Linked to ideas of social capital: if you link to two people who are not linked you can control their communication.



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