Lecture 7 - Social Network Analysis

Question 1

Why analyze social networks? (2)

Answer 1

1. Network influences people their behavior

2. Social networks can show the importance of individuals or groups

Question 2

Nodes

Answer 2

Objects, individuals, players

Question 3

Edges, links, ties

Answer 3

Connections between nodes

Question 4

Weighted edges

Answer 4

Intensity of a link, how often is this edge used?

Question 5

Unweighted edges

Answer 5

0 or 1

Question 6

Directed edges

Answer 6

one way relationship

Question 7

undirected edges

Answer 7

mutual relationships

Question 8

degree of a node

Answer 8

number of edges connected to a node

Question 9

neighbourhood

Answer 9

two nodes are neighbours if they share an edge in-between

Question 10

Density of a network

Answer 10

Average degree of all the nodes in the network

Question 11

Walk

Answer 11

Sequence of links connecting two nodes, this allows for repetition

Question 12

Cycle

Answer 12

A walk that starts and ends at the same node

Question 13

Path

Answer 13

A walk where a node appears at most once

Question 14

Geodesic

Answer 14

Shortest path between two nodes

Question 15

Diameter of a network

Answer 15

Maximum shortest path in a network

Question 16

Random network

Answer 16

Low clustering coefficient and low average path length

Question 17

Small world networks

Answer 17

High clustering coefficient and low average path length

Question 18

Scale free networks (protein networks)

Answer 18

These networks usually have hubs

Question 19

The strength of weak ties is?

Answer 19

Individuals in your close network are likely to know the same things you know, and individuals in your distant network are likely to know different things than you know. So if you want to gain knowledge, you should seek it at the edge of your network.

Question 20

Structural holes are very important what is it?

Answer 20

Structural holes are gaps in the networks that are only connected through one node, this node has a lot of power and value sinds they can act as information brokers between clusters.

• third party opportunities
• brokerage
• entrepreneurship