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2008 President · MN

Princeton Survey Research Associates International · fieldwork ended 2008-10-30 (5 days before the election) · 933 respondents · Live Phone

The poll said

Democrat 53% · Republican 42%

D+11.0

The certified result

Democrat 54.06% · Republican 43.82%

D+10.2

The arithmetic

  1. Poll margin = 53 − 42 = 11.00
  2. Actual margin = 54.060 − 43.823 = 10.237
  3. Signed miss = 11.00 − (10.237) = 0.763
  4. Absolute miss = |0.763| = 0.763

The poll overstated the Democrat by 0.8 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 16506, race ID 727 (538 database).