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Social network analysis

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Testo completo

(1)

Social network analysis

(2)

Co authorship

(3)

Alcohol consumption behavior

(4)

Protein protein interactions

(5)

How old is SNA?

• In 1934 Jacob Levy

Moreno describes the relationships among class mates as a social network

• In 1735 Euler uses

techniques of SNA to

solve the seven bridges

of Kònigsberg problem

(6)

How big are social networks

(7)

Centrality measures

• Degree: measures the probability of receiving information

Information hubs

• Betweenness: measures the information flow traffic that a node spreads through the network.

Critic resources in business process

• Closeness: measures how easy is to reach a node.

Resource positioning

• Eigenvector centrality: used to calculate node influence in the network.

Page rank

(8)

Centrality measures

(9)

Network flow

(10)

Romantic relations at Jefferson High

school

(11)

Community in the word co-occurrence

social network

(12)
(13)

Example

(14)

Example k=4

(15)

Example

(16)

Example

Riferimenti

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