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2008 President · IN

Public Policy Polling · fieldwork ended 2008-11-01 (3 days before the election) · 2,634 respondents · IVR

The poll said

Democrat 49% · Republican 48%

D+1.0

The certified result

Democrat 49.95% · Republican 48.91%

D+1.0

The arithmetic

  1. Poll margin = 49 − 48 = 1.00
  2. Actual margin = 49.946 − 48.914 = 1.032
  3. Signed miss = 1.00 − (1.032) = -0.032
  4. Absolute miss = |-0.032| = 0.032

The poll overstated the Republican by 0.0 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 16418, race ID 719 (538 database).