Small Word Experiment Siwen Zhang Milgrams Small World Experiment - - PowerPoint PPT Presentation

Small Word Experiment

Siwen Zhang

Milgram’s Small World Experiment

Instructions: Given a target individual(stockbroker in Boston) , pass the message to a person you correspond with who is “closest” to the target.

Milgram’s Small World Experiment

Outcome: 20% of initiated chains reached target Average chain length ~6.5 “Six degrees of separation”

Two significant features characterize a small-world network

• 1. Short paths exist.

And

• 2. People are good at finding them.

Milgram’s Small World Experiment

The “six degrees of separation” model

Small world phenomenon:

• social networks are “searchable”
• short acquaintance chains

Continued research Small world Project

Email experiment 60,000+ participants in 166 countries 18 targets in 13 countries including

• a professor at an Ivy League university
• an archival inspector in Estonia
• a technology consultant in India
• a policeman in Australia

and

• a veterinarian in the Norwegian army

24,000+ message chains

• Type, origin, and strength of social ties used to direct messages.

• Reason for choosing next recipient

Attrition rate is approximate constant

Estimate true distance distribution

Conclusion

• In the study of global social network, all targets may in fact be

reachable from random initial senders in only a few steps

• Small differences in either attrition rates or the chain lengths can have

a dramatic impact on the reachability of all targets.

• Successful global social network sensitively depends on individual

motivations.