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The Bucket Brigade
The Telephone Tree
The Military Squad
The simplest natural network is a dyad or pair
Dyads agglomerate to form
large interconnected webs
Finding Mr./Ms. Right
How Many Dates Does it Take?
2 in 3
Obesity in Framingham
Causes of Clustering
False positive
Homophily
(selection effects)
Contextual effects
(omitted variables)
Influence
(induction)
Results
Happiness in Framingham
Friend, Spouse Ties
Sibling Ties
Unhappy
Neutral
Happy
• Women
 Men
Three Degrees
of Influence
•Obesity
•Smoking
•Happiness
•Loneliness
•Drinking
•Depression
•Cooperation
•Piano teacher referrals
•Inventor ideas
Three Reasons for Three
Degrees
• Homo Sapiens
(150)
Intrinsic Decay
Network Instability
Evolutionary Purpose
Twins!
How Do We Take Our Natural
Social Networks Online?
Non
Smilers
Smilers
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Acknowledgements
Images: Wikipedia, FEMA, aussiegall,
Ramona.Forcella, quinet, moggs oceanlane, Flickr
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