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Opinion Poll Bias, House Effects, and Margin of Error
Oct 31, 2004 ... Using data at Pollingreport.com, the next graph shows the Bush vs. Kerry spread from each national poll taken since January 2004. ...
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Bias and House Effects in Presidential Job Performance polls
Comparison of presidential job approval polls for bias and house effects.
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Bias and House Effects in Presidential Job Performance polls
Here is the trend in President Bush's job performance rating since the ... This type of lean by different polling houses is often referred to as a house effect. ... Clinton's job performance as reported by different polling firms. ...
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