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2018 Senate · AZ

Vox Populi Polling · fieldwork ended 2018-10-29 (8 days before the election) · 677 respondents · Online Panel

The poll said

Democrat 52% · Republican 48%

D+4.0

The certified result

Democrat 49.96% · Republican 47.61%

D+2.3

The arithmetic

  1. Poll margin = 52 − 48 = 4.00
  2. Actual margin = 49.956 − 47.611 = 2.345
  3. Signed miss = 4.00 − (2.345) = 1.656
  4. Absolute miss = |1.656| = 1.656

The poll overstated the Democrat by 1.7 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 56673, race ID 96 (538 database).