Pew Study: Growing Gap between Landline and Dual Frame Election Polls

The Growing Gap between Landline and Dual Frame Election Polls – Republican Vote Share Bigger in Landline-Only Surveys – by Scott Keeter, Leah Christian and Michael Dimock, Pew Research Center, November 22, 2010

  • “The number of Americans who rely solely or mostly on a cell phone has been growing for several years, posing an increasing likelihood that public opinion polls conducted only by landline telephone will be biased. A new analysis of Pew Research Center pre-election surveys conducted this year finds that support for Republican candidates was significantly higher in samples based only on landlines than in dual frame samples that combined landline and cell phone interviews. The difference in the margin among likely voters this year is about twice as large as in 2008.
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    Posted in: Government Documents
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