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2010 Governor · NY

YouGov · fieldwork ended 2010-10-30 (3 days before the election) · 578 respondents · Online Panel

The poll said

Democrat 56% · Republican 29%

D+27.0

The certified result

Democrat 54.71% · Republican 27.04%

D+27.7

The arithmetic

  1. Poll margin = 56 − 29 = 27.00
  2. Actual margin = 54.709 − 27.042 = 27.667
  3. Signed miss = 27.00 − (27.667) = -0.667
  4. Absolute miss = |-0.667| = 0.667

The poll overstated the Republican by 0.7 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 32818, race ID 1298 (538 database).