Erlend Dancke Sandorf
(), Lars Persson
() and Thomas Broberg
Erlend Dancke Sandorf: University of Stirling, Stirling Management School, Economics Division
Lars Persson: CERE - the Center for Environmental and Resource Economics
Thomas Broberg: CERE - the Center for Environmental and Resource Economics
Abstract: Internet 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 to receive the monetary compensation. We identify professional respondents using data on panel tenure, survey response frequency, completion rates and total number of completed surveys. We find evidence of two types of professional respondents: "hyperactives" who answer surveys frequently and "experienced" who have long panel tenure and a large number of completed surveys. Using an integrated choice and latent variable model in a stated preference survey, we nd that "hyperactive" respondents are less likely to choose the 'status quo' and have a more stochastic choice process as seen from the econometrician's point of view, whereas "experienced" respondents have a relatively more deterministic choice process. Our results show that "hyperactive" respondents significantly impact estimated values.
28 pages, April 9, 2019
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