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2020 President · NC

Ipsos · fieldwork ended 2020-10-17 (17 days before the election) · 660 respondents · Probability Panel

The poll said

Democrat 49% · Republican 47%

D+2.0

The certified result

Democrat 48.59% · Republican 49.93%

R+1.3

The arithmetic

  1. Poll margin = 49 − 47 = 2.00
  2. Actual margin = 48.586 − 49.934 = -1.348
  3. Signed miss = 2.00 − (-1.348) = 3.348
  4. Absolute miss = |3.348| = 3.348

The poll overstated the Democrat by 3.3 points and had the wrong leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 71463, race ID 6238 (538 database).