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2008 President · AZ

YouGov · fieldwork ended 2008-10-25 (10 days before the election) · 682 respondents · Online Panel

The poll said

Democrat 46% · Republican 50%

R+4.0

The certified result

Democrat 45.12% · Republican 53.63%

R+8.5

The arithmetic

  1. Poll margin = 46 − 50 = -4.00
  2. Actual margin = 45.115 − 53.635 = -8.520
  3. Signed miss = -4.00 − (-8.520) = 4.520
  4. Absolute miss = |4.520| = 4.520

The poll overstated the Democrat by 4.5 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 16469, race ID 707 (538 database).