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2014 Senate · TN

Public Policy Polling · fieldwork ended 2014-10-18 (17 days before the election) · 595 respondents · IVR/Online Panel · partisan sponsor (DEM)

The poll said

Democrat 32% · Republican 45%

R+13.0

The certified result

Democrat 31.86% · Republican 61.87%

R+30.0

The arithmetic

  1. Poll margin = 32 − 45 = -13.00
  2. Actual margin = 31.865 − 61.867 = -30.002
  3. Signed miss = -13.00 − (-30.002) = 17.001
  4. Absolute miss = |17.001| = 17.001

The poll overstated the Democrat by 17.0 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 73246, race ID 28 (538 database).