Slides of the course on big data by C. Levallois from EMLYON Business School. For business students. Check the online video connected with these slides. -> Definition of networks and discussion on how useful they can be for business.

1. MK99 – Big Data 1
Big data & cross-platform analytics
MOOC lectures Pr. Clement Levallois

2. MK99 – Big Data 2
A primer on network analysis for business
•
Network
- A dataset made of entities and their relationships
•
Quasi synonym:
–
Graph

3. MK99 – Big Data 3
This is a network

4. MK99 – Big Data 4
Social networks
Source: http://www.minanacheva.com/getting-visual-with-facebook-data/
Network of friends on Facebook

5. MK99 – Big Data 5
But also network of products
Source: http://arxiv.org/abs/1111.3919
“Recipe recommendation using ingredient networks”

6. MK99 – Big Data 6
Or network of terms in a text
“Journal Editorials give indication of driving science issues”
Source: http://www.nature.com/nature/journal/v463/n7278/full/463157a.html
Visualization created with VosViewer
http://www.vosviewer.com

7. MK99 – Big Data 7
Networks can be huge
50,000 Twitter accounts of Swedish speakers
Source: http://twittercensus.se/graph2013/
In a non visual way: “The Anatomy of the Facebook Social Graph” (2011)
-> study of 721 million active Facebook users and the 69 billion friendship links connecting them

8. MK99 – Big Data 8
A note on the terminology
X
Y
A “node”
(also called a vertex, plural vertices).
An “edge”
(or a tie, or a link…)
A directed network
(the direction of the relation matters)
An undirected network
(the direction of the relation does not matter)
A weighted network
(the edges have a “strength” represented by a numerical value)
3
Y was born in …
Y’s marital status is …
Y’s latitude is …
Y’s longitude is …
Nodes attributes
(NB: edges can have attributes too!)

9. MK99 – Big Data 9
Networks: what use for business?

10. MK99 – Big Data 10
Segmentation
Same network, with segments highlighted
Car drivers and their similarities
Families with young children
Single men with sports tastes
Professionals who need pick-ups

11. MK99 – Big Data 11
Finding key players
Same network, with key players highlighted
A social network
Key player?
Gate keeper?

12. MK99 – Big Data 12
Understanding info spread
1. initial tweet
2. one retweet
3. retweets of the retweet
4. 3rd degree of propagation
Initial tweet:
@seinecle: “sentiment analysis on Twitter for free... finally put back online:t.co/YnAkiEIROq”
Service provided by http://wdmtg.com

13. MK99 – Big Data 13
Full dynamics, incl. for large networks
Video of the Dutch interbank money market:
all transactions, 2008-2013.
http://youtu.be/YvauCrHGWYc

14. MK99 – Big Data 14
Network visualizations in these slides were created with:

15. MK99 – Big Data 15
This slide presentation is part of a course offered by EMLYON Business School (www.em-lyon.com)
Contact Clement Levallois (levallois [at] em-lyon.com) for more information.