1:56 pm October 29, 2010, by jgalloway
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Rasmussen Reports, SurveyUSA and InsiderAdvantage all use automated polling equipment for their surveys – i.e., robo-calls. So over the next four days, you might keep in mind this observation from Nate Silver at fivethirtyeight.com:
Most of the automated polling firms have a Republican-leaning house effect. For instance, it’s about 2 points for Rasmussen Reports (our estimate for Rasmussen includes polls conducted by its subsidiary, Pulse Opinion Research) and 4 points for SurveyUSA.
Another automated polling firm, Public Policy Polling, has almost zero house effect. But some of the smaller robopoll firms, like Magellan and Merriman River Group, also have a Republican-leaning effect.
On average, the robopoll firms have a 2-point Republican-leaning house effect, whereas the live interviewer polls have a 0.7-point Democratic-leaning house effect. The difference between the two, then, is 2.7 points.
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