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Pollster biases revealed November 3, 2008

Posted by Sverre in : Methods in political science, US Presidential election , trackback

The Monkey Cage led me to a paper by Len Adleman and Mark Schiling that compares the election polls made by American networks. They’ve compared them to the polls made by Gallup And Rasmussen, and show that the political inclination of the networks seem to influence the polls. Fox’s polls show a trend of predicting more to the right, and CBS/NYT more to the left. This is really interesting.

I agree with Andrew Gelman who comments that this surprises him. I would expect their coverage of the polls to show some bias, but had expected the polls themselves to be done in a professional way eliminating personal biases. This apparently goes to show that being completely neutral is difficult if not impossible, even in quantitative analysis.

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