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2008 President · NV

Big Village · fieldwork ended 2008-10-20 (15 days before the election) · 700 respondents · Live Phone

The poll said

Democrat 49% · Republican 43%

D+6.0

The certified result

Democrat 55.15% · Republican 42.65%

D+12.5

The arithmetic

  1. Poll margin = 49 − 43 = 6.00
  2. Actual margin = 55.147 − 42.654 = 12.493
  3. Signed miss = 6.00 − (12.493) = -6.493
  4. Absolute miss = |-6.493| = 6.493

The poll overstated the Republican by 6.5 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 16748, race ID 737 (538 database).