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2010 Senate · NY

Siena College · fieldwork ended 2010-10-29 (4 days before the election) · 603 respondents · Live Phone

The poll said

Democrat 57% · Republican 37%

D+20.0

The certified result

Democrat 59.65% · Republican 28.13%

D+31.5

The arithmetic

  1. Poll margin = 57 − 37 = 20.00
  2. Actual margin = 59.645 − 28.130 = 31.515
  3. Signed miss = 20.00 − (31.515) = -11.515
  4. Absolute miss = |-11.515| = 11.515

The poll overstated the Republican by 11.5 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 32781, race ID 1531 (538 database).