In one of the first studies attempting to quantify media bias, Tim Groeling, a political scientist at the University of California, found that the media was actually harsher on Obama this summer than McCain. From the article in the upcoming Scientific American:
Groeling is hoping to advance scientific (and public) knowledge beyond this mush with research he used to demonstrate selection bias in television networks’ decision to run or withhold the results of presidential approval polls. For an article appearing in Presidential Studies Quarterly this December, Groeling designed a method to deal with a problem that often besets research on the media: people can identify all the news that journalists saw fit to print, but it’s more difficult to determine what they chose to ignore.
To counter the problem of the “unobserved population,” Groeling collected two different data sets: in-house presidential approval polling by ABC, CBS, NBC and FOX News and the networks’ broadcasts of such polls on evening news shows from January 1997 to February 2008. Groeling found that, with varying degrees of statistical significance, CBS, NBC and ABC showed what Groeling calls a pro-Democrat bias. For instance, CBS was 35 percent less likely to report a five-point drop in approval for Bill Clinton than a similar rise in approval and was 33 percent more likely to report a five-point drop than a rise for George W. Bush. Meanwhile FOX News showed a statistically significant pro-Republican bias in the most controlled of the three models Groeling tested: its Special Report program was 67 percent less likely to report a rise in approval for Clinton than a decrease and 36 percent more likely to report the increase rather than the decrease for Bush.
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