Aggregate Turnout Is Mismeasured

19 Pages Posted: 12 Jan 2018 Last revised: 29 Jan 2021

See all articles by Jonathan Mellon

Jonathan Mellon

University of Manchester

Geoffrey Evans

Nuffield College, University of Oxford

Edward A. Fieldhouse

University of Manchester

Jane Green

Nuffield College, University of Oxford

Christopher Prosser

University of London - Royal Holloway

Date Written: January 8, 2018

Abstract

Note: The UK analysis in this paper has been separated into its own paper availabe here: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3773695. Future iterations of this paper will extend the comparative analysis of registration and turnout.


We reveal errors in aggregate-level turnout measures in the US, UK and Sweden. In many cases, errors in measurement exceed substantive effects for institutional and event-based explanations of voter turnout: We find: 1) Errors in the vote numerator in the IDEA database sufficient to reverse the 1980-2016 trend in US VAP turnout; 2) VAP and VEP are increasingly diverging because of higher rates of non-eligible immigrants; 3) errors in the registration denominator in the IDEA database large enough to create an erroneous 18 percentage point fall in US RV turnout between 2004 and 2008, and 4) underestimation of RV turnout due to inaccuracies in the voter register up to 11.5 percentage points in the UK and 20 percentage points in the US. In sum, aggregate-level turnout measurement is so flawed that current claims about levels and explanations of turnout using them are practically meaningless.

Keywords: turnout, vep, vap, idea, aggregate, comparative politics, error, measurement, bias

Suggested Citation

Mellon, Jonathan and Evans, Geoffrey and Fieldhouse, Edward A. and Green, Jane and Prosser, Christopher, Aggregate Turnout Is Mismeasured (January 8, 2018). Available at SSRN: https://ssrn.com/abstract=3098436 or http://dx.doi.org/10.2139/ssrn.3098436

Jonathan Mellon (Contact Author)

University of Manchester ( email )

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Geoffrey Evans

Nuffield College, University of Oxford

New Road
Oxford, OX1 1NF
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Edward A. Fieldhouse

University of Manchester ( email )

Oxford Road
Manchester, M13 9PL
United Kingdom

Jane Green

Nuffield College, University of Oxford ( email )

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Oxford, OX1 1NF
United Kingdom
07956676216 (Phone)

Christopher Prosser

University of London - Royal Holloway ( email )

Egham Hill
Egham, TW20 0EX

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