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2008 Senate · GA

InsiderAdvantage · fieldwork ended 2008-10-23 (12 days before the election) · 615 respondents · Live Phone

The poll said

Democrat 42% · Republican 44%

R+2.0

The certified result

Democrat 46.83% · Republican 49.76%

R+2.9

The arithmetic

  1. Poll margin = 42 − 44 = -2.00
  2. Actual margin = 46.833 − 49.756 = -2.923
  3. Signed miss = -2.00 − (-2.923) = 0.924
  4. Absolute miss = |0.924| = 0.924

The poll overstated the Democrat by 0.9 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 16691, race ID 1550 (538 database).