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Why 2016 election polls missed their mark

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Pew Research Center will call 75% cellphones for surveys in 2016

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Advances in Telephone Survey Sampling

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Coverage Error in Internet Surveys

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What we learned about surveying with mobile apps

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Pew Research will call more cellphones in 2015

Short Read | Jan 15, 2014

Pew Research increases share of interviews conducted by cellphone