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2004 President · national

ABC News/The Washington Post · fieldwork ended 2004-10-14 (19 days before the election) · 709 respondents · Live Phone

The poll said

Democrat 47% · Republican 50%

R+3.0

The certified result

Democrat 48.13% · Republican 50.57%

R+2.4

The arithmetic

  1. Poll margin = 47 − 50 = -3.00
  2. Actual margin = 48.130 − 50.573 = -2.443
  3. Signed miss = -3.00 − (-2.443) = -0.556
  4. Absolute miss = |-0.556| = 0.556

The poll overstated the Republican by 0.6 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 15654, race ID 39 (538 database).