Why did the polls overestimate Liberal Democrat support? Sources of polling error in the 2010 British general election

Journal of Elections, Public Opinion and Parties

Volumn 21, Issue 2, 2011, Pages 179-209

  Pickup, Mark ^a   Matthews, J Scott ^b   Jennings, Will ^c   Ford, Robert ^d   Fisher, Stephen D ^e  

^a SIMON FRASER UNIVERSITY   (Canada)

^b QUEEN S UNIVERSITY   (Canada)

^c UNIVERSITY OF MANCHESTER   (United Kingdom)

^d UNIVERSITY OF MANCHESTER   (United Kingdom)

^e UNIVERSITY OF OXFORD   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 79957850142     PISSN: 17457289     EISSN: 17457297     Source Type: Journal    
DOI: 10.1080/17457289.2011.563309     Document Type: Article

References (38)

1. American Association for Public Opinion Research (AAPOR) (2010) AAPOR Report on Online Panels (Deerfield, IL: American Association for Public Opinion Research).
2. Bartels, Larry M. (1999) Panel effects in the American National Election Studies. Political Analysis, 8, pp. 1-20.
3. Berinsky, Adam (2005) Silent Voices: Public Opinion and Political Participation in America (Princeton, NJ: Princeton University Press).
4. Boon, Martin & Curtice, John (2010) General Election 2010: did the opinion polls flatter to deceive? 6 July, available at .
5. British Polling Council (2010) Accuracy of the final polls. Press Release, 8 May, available at .
6. Butt, Sarah & Curtice, John (2010) Duty in decline? Trends in attitudes to voting, in: Alisan Park, John Curtice, Katarina Thomson, Miranda Phillips, Clery Elizabeth & Sarah Butt (eds) British Social Attitudes: The 26th Report. London: Sage
7. Chang, Linchiat & Krosnick, Jon A. (2009) National surveys via RDD telephone interviewing versus the internet: comparing sample representativeness and response quality. Public Opinion Quarterly, 73(4), pp. 641-678.
8. Converse, Philip E. & Traugott, Michael W. (1986) Assessing the accuracy of polls and surveys. Science, 234: 1094(5).
9. Couper, Mick P. & Miller, P. V. (2008) Web survey methods introduction. Public Opinion Quarterly, 72(5), pp. 831-835.
10. Crespi, Irving (1988) Pre-Election Polling: Sources of Accuracy and Error (New York: Russell Sage).
11. Crewe, Ivor (1992) A nation of liars? Opinion polls and the 1992 election. Parliamentary Affairs, 45(4), pp. 475-495.
12. Curtice, John (1997) So how well did they do? The polls in the 1997 election. Journal of the Market Research Society, 39: 449(13).
13. Curtice, John & Sparrow, Nick (2010) Too clever by half? The impact of weighting and adjustments on the accuracy of final polls. International Journal of Market Research, 52(5), pp. 678-686.
14. Erikson, Robert S. & Tedin, Kent L. (2011) American public opinion: its origins, content, and impact, 8th edn (New York: Longman).
15. Erikson, Robert S. & Wlezien, Christopher (1999) Presidential polls as a time series: the case of 1996. Public Opinion Quarterly, 63, pp. 163-177.
16. Fisher, Stephen, Ford, Robert, Jennings, Will, Pickup, Mark & Wlezien, Christopher (n.d.) Polls and the vote in Britain. Paper presented at the Annual Meeting of the Elections, Public Opinion and Parties (EPOP) specialist group of the UK Political Studies Association, University of Essex, 2010.
17. Groves, Robert M. (2004) Survey Errors and Survey Costs (Hoboken, NJ: John Wiley).
18. Henry, Gary T. (1990) Practical Sampling. Thousand Oaks, CA: Sage Publications.
19. Jackman, Simon (2005) Pooling the polls over an election campaign. Australian Journal of Political Science, 40(4), pp. 499-516.
20. Jowell, Roger, Hedges, Barry, Lynn, Peter, Farrant, Graham & Heath, Anthony (1993) The 1992 British election: the failure of the polls. Public Opinion Quarterly, 57, pp. 238-263.
21. Kavanagh, D. & Cowley, P. (2010) The British General Election of 2010 (Basingstoke: Palgrave Macmillan).
22. Lau, Richard (1994) An analysis of the accuracy of 'trial heat' polls during the 1992 presidential election. Public Opinion Quarterly, 58(1), pp. 2-20.
23. Little, Roderick (1993) Post-stratification: a modeler's perspective. Journal of the American Statistical Association, 88, pp. 1001-1012.
24. Malhotra, Neil & Krosnick, John A. (2007). The effect of survey mode on inferences about political attitudes and behavior: comparing the 2000 and 2004 ANES to internet surveys with non-probability samples. Political Analysis, 15, pp. 286-323.
25. Market Research Society (1994) The Opinion Polls and the 1992 General Election (London: Market Research Society).
26. Noelle-Neumann, Elizabeth (1977) Turbulences in the climate of opinion: methodological applications of the spiral of silence theory. Public Opinion Quarterly, 41, pp. 143-158.
27. Perry, Paul (1979) Certain problems in election survey methodology. The Public Opinion Quarterly, 43, pp. 312-325.
28. Pickup, Mark (2009) What horse races can (and cannot) tell you. Paper presented at the Annual Conference of the Midwest Political Science Association, Chicago.
29. Pickup, Mark & Johnston, Richard (2007) Campaign trial heats as election forecasts: evidence from the 2004 and 2006 Canadian elections. Electoral Studies, 26, pp. 460-476.
30. Pickup, Mark & Johnston, Richard (2008) Campaign trial heats as election forecasts: measurement error and bias in 2004 presidential campaign polls. International Journal of Forecasting, 24(2), pp. 272-284.
31. Sanders, David, Clarke, Harold D., Stewart, Marianne C. & Whitely, Paul (2007) Does mode matter for modeling political choice? Evidence from the 2005 British Election Study. Political Analysis, 15, pp. 257-286.
32. Smithson, Mike (2010a) Did Lib Dem support just melt away on the day? 24 May, available at .
33. Smithson, Mike (2010b) And now the daily poll... forever. 8 July, available at .
34. Toepoel, Vera, Das, Marcel & Van Soest, Arthur (2007) Effects of design in web surveys: comparing trained and fresh respondents. Public Opinion Quarterly, 72(5), pp. 985-1007.
35. Voss, D. Stephen, Gelman, Andrew & King, Gary (1995) A review: preelection survey methodology: details from eight polling organizations, 1988 and 1992. Public Opinion Quarterly, 59, pp. 98-132.
36. Weisberg, Herbert (2005) The Total Survey Error Approach: A Guide to the New Science of Survey Research (Chicago: University of Chicago Press).
37. Wells, Anthony (2010) Why the polls got the Lib Dems wrong in 2010. UK Polling Report, 10 October, available at .
38. Worcester, Robert (1996) Political polling: 95% expertise and 5% luck. Journal of the Royal Statistical Society. Series A, 159(1), pp. 5-20.