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Social Networks and HealthModels, Methods, and Applications$

Thomas W. Valente

Print publication date: 2010

Print ISBN-13: 9780195301014

Published to Oxford Scholarship Online: May 2010

DOI: 10.1093/acprof:oso/9780195301014.001.0001

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(p.239) Appendix A: Glossary

(p.239) Appendix A: Glossary

Social Networks and Health
Oxford University Press

Average path length Average distance connecting nodes in the network (aka characteristic path length)

Bridge Ability of an individual to connect otherwise unconnected individuals or groups (Granovetter, 1973)

Centrality betweenness Degree an individual lies on the shortest path connecting others in the network (Freeman, 1979)

Centrality closeness Degree an individual is near others in the network (Freeman, 1979)

Centrality degree Number of ties an individual sends (out-degree) or receives (in-degree) (Freeman, 1979)

Centrality power Degree an individual can exert control over other members of the network (Bonacich, 1987)

Centralization The extent to which network links are focused on one or few nodes (Freeman, 1979)

Clique Set of individuals who communicate more frequently with one another than with others in the community

Component Set of individuals who are connected with another, but not with others in the community

Connectedness Ability of two individuals to reach one another directly or through intermediaries (Scott, 1991)

Density-personal network Proportion of ties among an individual's nominees (Scott, 1991)

Density-network Proportion of ties in the network (Scott, 1991)

Diameter Length of the longest geodesic path; distance between the two most distally connected nodes in the network

Distance In a network is the number of steps separating nodes

(p.240) Egocentric Network data collected from respondents about their contacts without interviewing those contacts (Burt, 1983; Marsden, 1987) (Appendix A)

ERGM Exponential random graph models used to test for structural properties of networks such as whether a network has a tendency for transitivity

Flow Measures the capacity of two individuals to transmit information to one another through all paths in the network (Freeman, Borgatti, & White, 1991)

Geodesic Shortest path between two people (Harary, Norman, & Cartwright, 1965)

INSNA International Network for Social Network Analysis (INSNA), the professional association for network analysts (see www.insna.org)

Matrix Array of rows and columns used to store network links. Usually a matrix is referred to as a letter and the number of rows and columns are subscripted. Each element in the matrix is given by its row and column number (Namboodori, 1983)

Multinet Computer program for testing co-evolution of networks and attributes

Name generator The specific network question asked in a survey to generate the network

Network exposure Percentage in an individual's personal network who have some property (Valente, 1995); for example, the percentage of friends who use the Internet

Network Set of relations between members of a community

Network threshold Proportion of adopters in an individual's personal network necessary for an individual to adopt (Valente, 1995, 1996)

Orgnet Software program used for social network analysis http://www.orgnet.com/

ORA Organizational Risk Analyzer; software used for social network analysis (http://www.casos.cs.cmu.edu/project/ora)

P* Methodology for testing structural properties of a network such as whether there is a tendency for transitivity in the network (Wasserman & Faust, 1994)

Pajek Software program used for social network analysis (http://vlado.fmf.uni-lj.si/pub/networks/pajek/)

R Computer language used to program network measures that is open-source and freely available on the Internet

Reach Ability of one node to contact another node through any number of intermediaries (Wasserman & Faust, 1994)

SIENA Simulation Investigation of Empirical Network Analysis; software platform used to estimate actor-oriented co-evolution models (Snijders, 2005)

Snowball sampling Snowball sampling consist of generating an initial sample of individuals and acquiring from this group a list of names that are then in turn interviewed and the ties of these second step individuals may also be interviewed, and so on

Sociometric Network data collected from the entire community (Wasserman & Faust, 1994)

STATNET Comprehensive network analysis software platform written in R

Structural equivalence Degree to which individuals have similar patterns of network ties in the community (status similarity) (Burt, 1987); sometimes referred to as positional equivalence

Tie Link between nodes

Triad Configuration of links between three nodes

Transitivity Tendency for two nodes linked to the same node to also be linked to each other

Triad census Calculate the percent of triads in a network that fall into 16 unique configurations

UCINET University of California at Irvine (UCI) Network Analysis software; a comprehensive network analysis package so named because the authors were at UCI when they created it

Visualizer Software program used for social network analysis (http://www.mdlogix.com/)