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2016 President · IN

Gravis Marketing · fieldwork ended 2016-10-31 (8 days before the election) · 399 respondents · Online Panel

The poll said

Democrat 39% · Republican 49%

R+10.0

The certified result

Democrat 37.77% · Republican 56.94%

R+19.2

The arithmetic

  1. Poll margin = 39 − 49 = -10.00
  2. Actual margin = 37.775 − 56.940 = -19.165
  3. Signed miss = -10.00 − (-19.165) = 9.165
  4. Absolute miss = |9.165| = 9.165

The poll overstated the Democrat by 9.2 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 48346, race ID 617 (538 database).