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

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Overview Social and political polarization Background: how many people do you know? Learning from “How many X’s do you know” surveys Next How many people do you know? Scale-up method “How many X’s” survey data Estimating group sizes: demonstration ◮ On average, you know 2.6 lawyers ◮ Assume average network size is 450 people ◮ Estimate: lawyers represent 2.6/450 = 0.58% of the network ◮ Estimate: 0.0058 · 290 million = 1.7 million lawyers in the U.S. ◮ On average, you know 0.25 people who were robbed last year ◮ Estimate: 0.25 450 · 290 million = 160,000 people robbed Gelman, DiPrete, Salganik, Teitler, Zheng Studying polarization using surveys
Overview Social and political polarization Background: how many people do you know? Learning from “How many X’s do you know” surveys Next How many people do you know? Scale-up method “How many X’s” survey data Estimating group sizes: demonstration ◮ On average, you know 2.6 lawyers ◮ Assume average network size is 450 people ◮ Estimate: lawyers represent 2.6/450 = 0.58% of the network ◮ Estimate: 0.0058 · 290 million = 1.7 million lawyers in the U.S. ◮ On average, you know 0.25 people who were robbed last year ◮ Estimate: 0.25 450 · 290 million = 160,000 people robbed Gelman, DiPrete, Salganik, Teitler, Zheng Studying polarization using surveys
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How many X's do you know'' surveys - Columbia University

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