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2009 Governor · VA

SurveyUSA · fieldwork ended 2009-10-25 (9 days before the election) · 502 respondents · IVR

The poll said

Democrat 41% · Republican 58%

R+17.0

The certified result

Democrat 41.26% · Republican 58.62%

R+17.4

The arithmetic

  1. Poll margin = 41 − 58 = -17.00
  2. Actual margin = 41.255 − 58.619 = -17.364
  3. Signed miss = -17.00 − (-17.364) = 0.364
  4. Absolute miss = |0.364| = 0.364

The poll overstated the Democrat by 0.4 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 63790, race ID 1312 (538 database).