Exit polling in a cold climate: the BBC-ITV experience in Britain in 2005

J.K. Curtice, D. Firth

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Conducting an exit poll to forecast the outcome of a national election in terms of both votes and seats is particularly difficult in Britain. No official information is available on how individual polling stations voted in the past, use of single-member plurality means that there is no consistent relationship between votes and seats, electors can choose to vote by post and most of those who vote in person do so late in the day. In addition, around one in every six intended exit poll respondents refuses to participate. Methods that were developed to overcome these problems, and their use in the successful 2005 British Broadcasting Corporation-Independent Television exit poll, are described and evaluated. The methodology included a panel design to allow the estimation of electoral change at local level, coherent multiple-regression modelling of multiparty electoral change to capture systematic patterns of variation, probabilistic prediction of constituency winners to account for uncertainty in projected constituency level shares, collection of information about the voting intentions of postal voters before polling day and access to interviewer guesses on the voting behaviour of refusals. The coverage and accuracy of the exit poll data are critically examined, the effect of key aspects of the statistical modelling of the data is assessed and some general lessons are drawn for the design and analysis of electoral exit polls.
LanguageEnglish
Pages509-539
Number of pages31
JournalJournal of the Royal Statistical Society. Series A (General)
Volume171
Issue number3
DOIs
Publication statusPublished - Jun 2008

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BBC
voter
climate
experience
voting behavior
available information
voting
television
coverage
election
uncertainty
regression
human being
methodology
interview

Keywords

  • exit poll
  • forecasting
  • general election
  • postal voting
  • probability calibration
  • steed swing
  • swingometer
  • ternary diagram

Cite this

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Exit polling in a cold climate : the BBC-ITV experience in Britain in 2005. / Curtice, J.K.; Firth, D.

In: Journal of the Royal Statistical Society. Series A (General) , Vol. 171, No. 3, 06.2008, p. 509-539.

Research output: Contribution to journalArticle

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