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2016 President · CA

YouGov · fieldwork ended 2016-10-28 (11 days before the election) · 1,498 respondents · Online Panel

The poll said

Democrat 53% · Republican 33%

D+20.0

The certified result

Democrat 61.73% · Republican 31.62%

D+30.1

The arithmetic

  1. Poll margin = 53 − 33 = 20.00
  2. Actual margin = 61.726 − 31.617 = 30.109
  3. Signed miss = 20.00 − (30.109) = -10.109
  4. Absolute miss = |-10.109| = 10.109

The poll overstated the Republican by 10.1 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 48125, race ID 606 (538 database).