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2016 President · national

Ipsos · fieldwork ended 2016-11-04 (4 days before the election) · 2,195 respondents · Online Panel

The poll said

Democrat 42% · Republican 39%

D+3.0

The certified result

Democrat 48.00% · Republican 45.81%

D+2.2

The arithmetic

  1. Poll margin = 42 − 39 = 3.00
  2. Actual margin = 47.997 − 45.815 = 2.182
  3. Signed miss = 3.00 − (2.182) = 0.819
  4. Absolute miss = |0.819| = 0.819

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 48922, race ID 94 (538 database).