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The use of respondent incentives on longitudinal surveys

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  • Laurie, Heather
  • Lynn, Peter

Abstract

Incentives in the form of a gift or money are given to survey respondents in the hope that this will increase response rates and possibly also reduce non-response bias. They can also act as a means of thanking respondents for taking part and showing appreciation for the time the respondent has given to the survey. There is a considerable literature devoted to the effects of respondent incentives, though most studies are based on cross-sectional surveys. These studies show that the both the form of the incentive, gift or money, and the way in which the incentive is delivered to the respondent has a measurable impact on response rates. A monetary incentive sent to the respondent in advance of the interview has the greatest effect on increasing response, regardless of the amount of money involved. This type of unconditional incentive is thought to operate through a process of social reciprocity where the respondent perceives that they have received something unconditionally on trust so reciprocate in kind by taking part in the research. Some of the literature suggests an improvement in data quality from respondents who are given an incentive, in terms of reduced item non-response and reduced bias through encouraging certain demographic groups to participate who otherwise might refuse. It is generally felt that incentives are more appropriate the greater the burden to respondents of taking part. Longitudinal surveys certainly constitute high burden surveys, but there is little guidance on how and when incentives should be employed on longitudinal surveys. In this paper, we review the use that is made of incentives on longitudinal surveys, describing common practices and the rationale for these practices. We attempt to identify the features of longitudinal surveys that are unique and the features that they share with cross-sectional surveys in terms of motivations and opportunities for the use of incentives and possible effects of incentives. We then review experimental evidence on the effects of incentives on longitudinal surveys. Finally, we report on two experimental studies carried out in the UK. These both address a particular issue in longitudinal surveys, namely the effect of changing the way that incentives are used part-way through the survey. Each experiment addressed a different type of change. The first experiment was carried out on the British Election Panel Survey, where an incentive was introduced for the first time at wave 6. Three experimental groups were used at both waves 6 and 7, consisting of a zero incentive and two different values of unconditional incentive. The second experiment was carried out on wave 14 (2004) of the British Household Panel Survey (BHPS). BHPS respondents have always received a gift token as an incentive and since wave 6 of the study (1996) this has been offered unconditionally in advance of the interview to the majority of respondents. The wave 14 experiment was designed to assess the effect on response of increasing the level of the incentive offered from £7 to £10 for established panel members, many of whom have co-operated with the survey for thirteen years.

Suggested Citation

  • Laurie, Heather & Lynn, Peter, 2008. "The use of respondent incentives on longitudinal surveys," ISER Working Paper Series 2008-42, Institute for Social and Economic Research.
  • Handle: RePEc:ese:iserwp:2008-42
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    File URL: https://www.iser.essex.ac.uk/research/publications/working-papers/iser/2008-42.pdf
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    References listed on IDEAS

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    1. Lynn, Peter & Buck, Nick & Burton, Jonathan & Jäckle, Annette & Laurie, Heather, 2005. "A review of methodological research pertinent to longitudinal survey design and data collection," ISER Working Paper Series 2005-29, Institute for Social and Economic Research.
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    Cited by:

    1. Sascha Becker & Dolores Messer & Stefan C. Wolter, 2011. "A Gift is not Always a Gift: Gift Exchange in a Voucher Experiment," CESifo Working Paper Series 3488, CESifo Group Munich.
    2. Nic Baigrie & Katherine Eyal, 2014. "An Evaluation of the Determinants and Implications of Panel Attrition in the National Income Dynamics Survey (2008-2010)," South African Journal of Economics, Economic Society of South Africa, vol. 82(1), pages 39-65, March.
    3. Laura Fumagalli & Heather Laurie & Peter Lynn, 2013. "Experiments with methods to reduce attrition in longitudinal surveys," Journal of the Royal Statistical Society Series A, Royal Statistical Society, vol. 176(2), pages 499-519, February.
    4. Frick, Joachim R. & Grabka, Markus M. & Groh-Samberg, Olaf, 2012. "Dealing With Incomplete Household Panel Data in Inequality Research," EconStor Open Access Articles, ZBW - German National Library of Economics, pages 89-123.
    5. Sascha O. Becker & Dolores Messer & Stefan C. Wolter, 2013. "A Gift is Not Always a Gift: Heterogeneity and Long-term Effects in a Gift Exchange Experiment," Economica, London School of Economics and Political Science, vol. 80(318), pages 345-371, April.
    6. McGonagle Katherine A. & Schoeni Robert F. & Couper Mick P., 2013. "The Effects of a Between-Wave Incentive Experiment on Contact Update and Production Outcomes in a Panel Study," Journal of Official Statistics, De Gruyter Open, vol. 29(2), pages 261-276, September.
    7. Sadig, Husam, 2014. "Unknown eligibility whilst weighting for non-response: the puzzle of who has died and who is still alive?," ISER Working Paper Series 2014-35, Institute for Social and Economic Research.
    8. Nicole Watson & Mark Wooden, 2011. "Re-engaging with Survey Non-respondents: The BHPS, SOEP and HILDA Survey Experience," Melbourne Institute Working Paper Series wp2011n02, Melbourne Institute of Applied Economic and Social Research, The University of Melbourne.
    9. Carine Burricand & Jean-Paul Lorgnet, 2014. "L’attrition dans l’enquête SRCV : déterminants et effets sur la mesure des variables monétaires," Économie et Statistique, Programme National Persée, vol. 469(1), pages 19-35.
    10. Pforr, Klaus & Blohm, Michael & Blom, Annelies G. & Erdel, Barbara & Felderer, Barbara & Fräßdorf, Mathis & Hajek, Kristin & Helmschrott, Susanne & Kleinert, Corinna & Koch, Achim & Krieger, Ulrich & , 2015. "Are Incentive Effects on Response Rates and Nonresponse Bias in Large-scale, Face-to-face Surveys Generalizable to Germany? Evidence from Ten Experiments," EconStor Open Access Articles, ZBW - German National Library of Economics, pages 740-768.

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