Pew Research Center for the People & the Press

What's Missing from National RDD Surveys? The Impact of the Growing Cell-Only Population

by Scott Keeter (Pew Research Center), Courtney Kennedy (University of Michigan and Pew Research Center), April Clark (Pew Research Center), Trevor Tompson (The Associated Press), and Mike Mokrzycki (The Associated Press)
June 20, 2007

The number of cell-phone-only households has continued to grow -- 12.8% of all households by the end of 2006, according to the National Health Interview Survey. While the noncoverage problem is currently not damaging estimates for the entire population, a study finds evidence that it does create biased estimates on certain variables for young adults, 25% of whom are cell-only.

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