Abstract
The increasing use of internet surveys for stated preference studies raises questions about the effect of the survey mode on welfare estimates. A number of studies have conducted convergent validity investigations that compare the use of the internet with other survey implementation modes such as mail, telephone and in-person. All, but one, of these comparison studies is confounded different sample frames for the different modes of survey implementation. In this study we investigate differences in internet and mail survey modes holding the sample frame constant. This is done in the context of a choice-modelling study of improvements in the River Murray in Australia. We also investigate sample frame holding the survey mode (mail) constant. We find that survey mode (internet vs. mail) influences welfare estimates, and the internet welfare estimates are about 78 % of the mail welfare estimates on average. There is not a significant effect of sample frame (internet panel vs. postal addresses) on welfare estimates for implementation of a mail survey.
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Notes
Bell et al. (2011) also estimated willingness to pay across modes when sociodemographics were held constant. They found with this correction that the Internet Panel ($31) produced a lower value than Mall Intercept ($43) and Phone–Mail ($54), and similar values to sampling at a Central Location ($29).
Attributes and attribute levels were selected through consultation with hydrologists and ecologists. Their knowledge of the river was based on ecosystem modelling and from information contained in publications documenting river conditions (Department of Water, Land and Biodiversity Conservation 2006; Murray-Darling Basin Ministerial Council 2003; Overton and Doody 2008; Paton 2000; Paton et al. 2009).
The MM sample stratification was as follows: the Murray-Darling Basin catchment area (\(\hbox {n}=1\),000), New South Wales (\(\hbox {n}=1\),400), South Australia (\(\hbox {n}=1\),000), Victoria (\(\hbox {n}=1\),200), and the rest of Australia (Queensland, Western Australia, Tasmania and the Northern Territory (\(\hbox {n}=1\),400).
The error component model approximates the nested logit model in accounting for scale differences. Train (2009) states “(a)llowing different variances for the random quantities is analogous to allowing the inclusive value coefficient to differ across nests in the nested logit model” (p. 140). Hensher and Rose (2008) demonstrate this in practice by using the error components model to combine stated-preference and revealed-preference data, which is similar to combing different survey mode data sets in the current paper. The error component model has the advantage offered as per the nested logit model, and also accounts for the panel nature of the response data.
We were not able to investigate sample selection because information on nonrespondents was not available for all samples, e.g., the II treatment. Second, there is not currently a sample-selection estimator, a la Heckman, for categorical response data beyond two responses (a bivariate probit model) and indirect and imperfect approaches must be used to investigate sample selection in choice models (Yuan et al. 2015). This is a topic that deserves consideration in future mode comparison studies.
Raking or sample-balancing is an iterative method for deriving sampling weights on survey data to match multiple characteristics of the population. Where a simple reweighting of the survey data can correct for an imbalance in one characteristic, for example gender, correcting for imbalances across multiple characteristics in the sample generally requires a more complicated set of sample weights (Battaglia et al. 2009).
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Boyle, K.J., Morrison, M., MacDonald, D.H. et al. Investigating Internet and Mail Implementation of Stated-Preference Surveys While Controlling for Differences in Sample Frames. Environ Resource Econ 64, 401–419 (2016). https://doi.org/10.1007/s10640-015-9876-2
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DOI: https://doi.org/10.1007/s10640-015-9876-2