1. Social Network Theory
Dr. Zaheeruddin Asif

2. What is a Network? Nodes Relationships Properties Directional
Symmetric
Flow
Mulitplexity

3. Nodes

4. Relationships
Directional
Friendship
Advice seeking
Buyer/supplier

5. Relationships Symmetric Strategic alliance Club membership
Co-authorship

6. Transitivity

7. Reciprocity

8. Network Scope
Ego-centric
Socio-centric
Open-system

9. Socio-centric

10. Combined ego-networks of five active authors

15. Centrality Degree centrality:
"An important node is involved in large number of interactions“

16. Centrality Closeness centrality:
"An important node is typically “close” to, and can communicate quickly with, the other nodes in the network. “

17. Centrality Betweenness centrality:
"An important node will lie on a high proportion of paths between other nodes in the network."

18. Hubs and Bridges
(in-degree)
Betweenness = Size

19. Closeness Centrality

20. Betweenness Centrality

21. Theories of Networks Social Capital Structural Holes Social Exchange
Collective Action
Cognitive theories
Homophily theories

22. Social Capital
Pierre Bourdieu

23. Social Capital Pierre Bourdieu
"the sum of the resources, actual or virtual, that accrue to an individual or a group by virtue of possessing a durable network of more or less institutionalized relationships of mutual acquaintance and recognition"

24. Social exchange
Social exchange or dependence theories hold that people form ties with whom they can exchange resources, and only those ties that are mutually beneficial will be sustained over time.

26. Propinquity
Geographically close nodes are more likely to be connected.

27. Homophily
Pairs can be said to be homophilous if they their characteristics match in a proportion greater than expected in the population from which they are drawn or the network of which they are a part (Verbrugge 1977).

28. Homophily
Homophily theories claim that people form ties with those they consider similar to themselves.

29. References http://www.commetrix.de/IRIS