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2008 President · NV

InsiderAdvantage · fieldwork ended 2008-10-19 (16 days before the election) · 690 respondents · Live Phone

The poll said

Democrat 47% · Republican 47%

even

The certified result

Democrat 55.15% · Republican 42.65%

D+12.5

The arithmetic

  1. Poll margin = 47 − 47 = 0.00
  2. Actual margin = 55.147 − 42.654 = 12.493
  3. Signed miss = 0.00 − (12.493) = -12.493
  4. Absolute miss = |-12.493| = 12.493

The poll overstated the Republican by 12.5 points and showed a tie.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 16798, race ID 737 (538 database).