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2020 President · MI

Mitchell Research & Communications · fieldwork ended 2020-10-18 (16 days before the election) · 900 respondents · IVR/Live Phone

The poll said

Democrat 51% · Republican 41%

D+10.0

The certified result

Democrat 50.62% · Republican 47.84%

D+2.8

The arithmetic

  1. Poll margin = 51 − 41 = 10.00
  2. Actual margin = 50.621 − 47.837 = 2.784
  3. Signed miss = 10.00 − (2.784) = 7.216
  4. Absolute miss = |7.216| = 7.216

The poll overstated the Democrat by 7.2 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 71367, race ID 6233 (538 database).