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2018 Governor · AZ

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

The poll said

Democrat 46% · Republican 54%

R+8.0

The certified result

Democrat 41.84% · Republican 56.00%

R+14.2

The arithmetic

  1. Poll margin = 46 − 54 = -8.00
  2. Actual margin = 41.842 − 56.002 = -14.160
  3. Signed miss = -8.00 − (-14.160) = 6.161
  4. Absolute miss = |6.161| = 6.161

The poll overstated the Democrat by 6.2 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 56673, race ID 133 (538 database).