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1998 Governor · IL

Harris Insights & Analytics · fieldwork ended 1998-10-30 (4 days before the election) · 847 respondents · Live Phone

The poll said

Democrat 41% · Republican 55%

R+14.0

The certified result

Democrat 47.46% · Republican 51.03%

R+3.6

The arithmetic

  1. Poll margin = 41 − 55 = -14.00
  2. Actual margin = 47.464 − 51.034 = -3.570
  3. Signed miss = -14.00 − (-3.570) = -10.430
  4. Absolute miss = |-10.430| = 10.430

The poll overstated the Republican by 10.4 points and had the right leader.

Where these numbers come from

Poll and result: 538 raw_polls.csv. Poll ID 54298, race ID 1443 (538 database).