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2009 Governor · NJ

GQR · fieldwork ended 2009-10-31 (3 days before the election) · 606 respondents · Live Phone · partisan sponsor (DEM)

The poll said

Democrat 47% · Republican 41%

D+6.0

The certified result

Democrat 44.88% · Republican 48.46%

R+3.6

The arithmetic

  1. Poll margin = 47 − 41 = 6.00
  2. Actual margin = 44.879 − 48.457 = -3.578
  3. Signed miss = 6.00 − (-3.578) = 9.578
  4. Absolute miss = |9.578| = 9.578

The poll overstated the Democrat by 9.6 points and had the wrong leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 42290, race ID 1311 (538 database).