Degree CentralityDegree- number of connected nodesIn-degree- number of nodes initiating a relationships with a given nodeIn ties, links directed to a nodeOut-degree- number of nodes one initiated links withOut ties, links sent from a nodeFacebook- no direction bc both have to be friendsTwitter- direction bc you can follow person but they don’t have to follow backThink about your network of friends in this classWhat would be your degree centralityIf you have a high degree centrality, what does it mean?If you have a low degree centrality, what does it mean?Structural HolesHomophily- the tendency of individuals to associate themselves with similar individualsThere is greater homogeneity of behavior, opinion, information, and ideas within groups of people than between groups of peopleThose who connect these subgroups have an advantageBetween CentralityIdentifying and measuring bridgesA measure of actor’s as beingClustering coefficientA way to evaluate one contribution to the network by investigating the network without itTo what extent does the network depend on YOU for its connectivity?Do everyone I know, know anyone I know?How many of your friends are not connected to your friends, besides through you?Interestingly: clustering coefficient values are negatively associated with socio-economic statusDescriptive network measurementsSize- number of nodesActivity/volume- number of linksDensityA network measure of interconnectednessDensity= total number of existing links/number of possible linksWhy important?Dependency on a few?Resilience/stabilityAn indication of a communityDirection of information flow09/11/2014Degree Centrality-Degree- number of connected nodes-In-degree- number of nodes initiating a relationships with a given nodeoIn ties, links directed to a node-Out-degree- number of nodes one initiated links withoOut ties, links sent from a node-Facebook- no direction bc both have to be friends-Twitter- direction bc you can follow person but they don’t have to follow backThink about your network of friends in this classWhat would be your degree centralityIf you have a high degree centrality, what does it mean?If you have a low degree centrality, what does it mean?Structural Holes-Homophily- the tendency of individuals to associate themselves withsimilar individuals-There is greater homogeneity of behavior, opinion, information, and ideas within groups of people than between groups of people-Those who connect these subgroups have an advantageBetween Centrality-Identifying and measuring bridgesoA measure of actor’s as beingClustering coefficient-A way to evaluate one contribution to the network by investigating the network without itoTo what extent does the network depend on YOU for its connectivity?oDo everyone I know, know anyone I know?oHow many of your friends are not connected to your friends, besides through you?oInterestingly: clustering coefficient values are negatively associated with socio-economic statusDescriptive network measurements-Size- number of nodes-Activity/volume- number of linksDensity-A network measure of interconnectedness-Density= total number of existing links/number of possible links-Why important?oDependency on a few?oResilience/stabilityoAn indication of a communityoDirection of information
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