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2012 Senate · PA

Angus Reid Global · fieldwork ended 2012-11-03 (3 days before the election) · 507 respondents · Online Panel

The poll said

Democrat 53% · Republican 46%

D+7.0

The certified result

Democrat 53.69% · Republican 44.59%

D+9.1

The arithmetic

  1. Poll margin = 53 − 46 = 7.00
  2. Actual margin = 53.690 − 44.588 = 9.102
  3. Signed miss = 7.00 − (9.102) = -2.102
  4. Absolute miss = |-2.102| = 2.102

The poll overstated the Republican by 2.1 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 30774, race ID 1495 (538 database).