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2016 President · MO

Mason-Dixon Polling & Strategy · fieldwork ended 2016-10-25 (14 days before the election) · 625 respondents · Live Phone

The poll said

Democrat 42% · Republican 47%

R+5.0

The certified result

Democrat 38.13% · Republican 56.77%

R+18.6

The arithmetic

  1. Poll margin = 42 − 47 = -5.00
  2. Actual margin = 38.135 − 56.772 = -18.637
  3. Signed miss = -5.00 − (-18.637) = 13.637
  4. Absolute miss = |13.637| = 13.637

The poll overstated the Democrat by 13.6 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 47629, race ID 626 (538 database).