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2018 Senate · FL

University of North Florida Public Opinion Research Lab · fieldwork ended 2018-10-25 (12 days before the election) · 1,051 respondents · Live Phone

The poll said

Democrat 47% · Republican 46%

D+1.0

The certified result

Democrat 49.93% · Republican 50.05%

R+0.1

The arithmetic

  1. Poll margin = 47 − 46 = 1.00
  2. Actual margin = 49.932 − 50.055 = -0.123
  3. Signed miss = 1.00 − (-0.123) = 1.123
  4. Absolute miss = |1.123| = 1.123

The poll overstated the Democrat by 1.1 points and had the wrong leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 56537, race ID 100 (538 database).