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12 Jan

Social network analysis has its theoretical roots in the work of early sociologists such as Georg Simmel and Émile Durkheim, who wrote about the importance of studying patterns of relationships that connect social actors.

Social scientists have used the concept of "social networks" since early in the 20th century to connote complex sets of relationships between members of social systems at all scales, from interpersonal to international.

A positive edge between two nodes denotes a positive relationship (friendship, alliance, dating) and a negative edge between two nodes denotes a negative relationship (hatred, anger).

Signed social network graphs can be used to predict the future evolution of the graph.

Transitivity is an outcome of the individual or situational trait of Need for Cognitive Closure.

Tie Strength: Defined by the linear combination of time, emotional intensity, intimacy and reciprocity (i.e. Strong ties are associated with homophily, propinquity and transitivity, while weak ties are associated with bridges.

Groups are identified as 'cliques' if every individual is directly tied to every other individual, 'social circles' if there is less stringency of direct contact, which is imprecise, or as structurally cohesive blocks if precision is wanted.

Cohesion: The degree to which actors are connected directly to each other by cohesive bonds.

Structural cohesion refers to the minimum number of members who, if removed from a group, would disconnect the group.