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2020 President · PA

Gravis Marketing · fieldwork ended 2020-10-23 (11 days before the election) · 602 respondents · IVR/Online Panel

The poll said

Democrat 51% · Republican 44%

D+7.0

The certified result

Democrat 50.01% · Republican 48.84%

D+1.2

The arithmetic

  1. Poll margin = 51 − 44 = 7.00
  2. Actual margin = 50.008 − 48.844 = 1.164
  3. Signed miss = 7.00 − (1.164) = 5.835
  4. Absolute miss = |5.835| = 5.835

The poll overstated the Democrat by 5.8 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 71824, race ID 6249 (538 database).