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2016 Governor · NC

SurveyUSA · fieldwork ended 2016-10-30 (9 days before the election) · 659 respondents · IVR/Online Panel

The poll said

Democrat 48% · Republican 47%

D+1.0

The certified result

Democrat 49.02% · Republican 48.80%

D+0.2

The arithmetic

  1. Poll margin = 48 − 47 = 1.00
  2. Actual margin = 49.016 − 48.798 = 0.218
  3. Signed miss = 1.00 − (0.218) = 0.782
  4. Absolute miss = |0.782| = 0.782

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 48008, race ID 52 (538 database).