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Choice Modelling Centre Seminar Institute for Transport Studies University of Leeds Assessing the impact of “professional” respondents using an Integrated Choice and Latent Variable model Speaker: Erlend Dancke Sandorf, Research Fellow at the Centre for Environmental and Resource Economics, Umeå, Sweden 8 February 2017, 11:00 to 12:00 University of Leeds, Institute for Transport Studies (ITS) Room 1.11 Online panels are increasingly used for stated preference research, and members of such panels receive compensation for each completed survey. One concern is that over time this creates professional respondents who answer surveys purely for the monetary compensation. We identify professional respondents using data on panel tenure, average number of surveys per month, response latency, survey satisficing indicators and self-reported effort measures. Using an ICLV model we find that professional respondents are less likely to choose the 'opt-out' alternative, state higher levels of effort, and engage in less survey satisficing. Furthermore, the model performs worse in terms of predicting more professional respondents' choices relative to less professional respondents. We discuss the impact of professional respondents on the willingness-to-accept measures and provide a few suggestions for future research. About Erlend: Erlend Dancke Sandorf is a post-doctoral researcher at the Centre for Environmental and Resource Economics in Umeå. His research focuses on non-market valuation of ecosystem services using stated preference methods. In particular, the use of advanced discrete choice models to accommodate non-utility maximizing behavior, and the use of simplifying strategies and heuristics. He has worked with models that consider simplifying strategies such as attribute non-attendance, elimination-by-aspects and satisficing. He is an environmental economist with a Ph.D. in Economics.