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2016 President · national

GfK Group · fieldwork ended 2016-10-22 (17 days before the election) · 1,212 respondents · Probability Panel

The poll said

Democrat 51% · Republican 37%

D+14.0

The certified result

Democrat 48.00% · Republican 45.81%

D+2.2

The arithmetic

  1. Poll margin = 51 − 37 = 14.00
  2. Actual margin = 47.997 − 45.815 = 2.182
  3. Signed miss = 14.00 − (2.182) = 11.819
  4. Absolute miss = |11.819| = 11.819

The poll overstated the Democrat by 11.8 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 47538, race ID 94 (538 database).