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How many X's do you know'' surveys - Columbia University

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Overview<br />

Social and political polarization<br />

Background: how <strong>many</strong> people <strong>do</strong> <strong>you</strong> know?<br />

Learning from “<strong>How</strong> <strong>many</strong> X’s <strong>do</strong> <strong>you</strong> know” <strong>surveys</strong><br />

Next<br />

3 models<br />

Fitting our model<br />

Results: how <strong>many</strong> people <strong>do</strong> <strong>you</strong> know?<br />

Results: group sizes and overdispersions<br />

Confidence building and model extensions<br />

Group, j percentage of network, e β j overdispersion, ω j<br />

0.03% 0.1% 0.3% 1 4 7 10<br />

Stephanie<br />

Jacqueline<br />

Kimberly<br />

Nicole<br />

Christina<br />

Jennifer<br />

Christopher<br />

David<br />

Anthony<br />

Robert<br />

James<br />

Michael<br />

Woman a<strong>do</strong>pted kid in past yr<br />

Gave birth in past yr<br />

Woman raped<br />

Commercial pilot<br />

Gun dealer<br />

AIDS<br />

HIV−positive<br />

Male in prison<br />

Member of Jaycees<br />

Suicide in past yr<br />

Twin<br />

Died in auto accident Gelman, in past DiPrete, yr Salganik, Teitler, Zheng<br />

Studying polarization using <strong>surveys</strong>

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