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2012 President · national

Ipsos · fieldwork ended 2012-10-29 (8 days before the election) · 4,085 respondents · Online Panel

The poll said

Democrat 47% · Republican 46%

D+1.0

The certified result

Democrat 50.91% · Republican 46.97%

D+3.9

The arithmetic

  1. Poll margin = 47 − 46 = 1.00
  2. Actual margin = 50.909 − 46.974 = 3.935
  3. Signed miss = 1.00 − (3.935) = -2.935
  4. Absolute miss = |-2.935| = 2.935

The poll overstated the Republican by 2.9 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 30502, race ID 37 (538 database).