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2012 President · national

Angus Reid Global · fieldwork ended 2012-11-02 (4 days before the election) · 1,019 respondents · Online Panel

The poll said

Democrat 51% · Republican 48%

D+3.0

The certified result

Democrat 50.91% · Republican 46.97%

D+3.9

The arithmetic

  1. Poll margin = 51 − 48 = 3.00
  2. Actual margin = 50.909 − 46.974 = 3.935
  3. Signed miss = 3.00 − (3.935) = -0.935
  4. Absolute miss = |-0.935| = 0.935

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

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 30793, race ID 37 (538 database).