It is important to remember that the Rasmussen Reports job approval ratings are based upon a sample of likely voters. Some other firms base their approval ratings on samples of all adults. President Obama's numbers are always several points higher in a poll of adults rather than likely voters. That's because some of the President's most enthusiastic supporters, such as young adults, are less likely to turn out to vote. Other factors are also important to consider when comparing Job Approval ratings from different polling firms.
Rasmussen # 1 in accuracy!
Fordham University
For inquiries: cpanagopoulo@fordham.edu or (917) 405-9069
For all the derision directed toward pre-election polling, the final poll estimates were not
far off from the actual nationwide voteshares for the two candidates. On average, preelection
polls from 23 public polling organizations projected a Democratic advantage of
7.52 percentage points on Election Day, which is only about 1.37 percentage points away
from the current estimate of a 6.15-point Obama margin in the national popular vote.
Following the procedures proposed by Martin, Traugott and Kennedy (see Public Opinion
Quarterly, Fall 2006, pp. 342-369) to assess poll accuracy, I analyze poll estimates from
these 23 polling organizations. Four of these polls appear to have overestimated McCain
support (indicated with a * below), while most polls (17) overestimated Obama strength.
Pre-election projections for two organizations’ final polls—Rasmussen and Pew—were
perfectly in agreement with the actual election result (**).
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