Research Methodology 
11.22.10
The Growing Gap between Landline and Dual Frame Election Polls; Republican Vote Share Bigger in Landline-Only Surveys
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.
05.20.10
