variables and on the validity of the classical assumption. We begin by summarizing the literature on biases due to measurement … studies allow us to assess the magnitude of measurement errors in survey data, and the validity of the classical assumption …. In addition to the magnitude of the errors, we also focus on the validity of the classical assumption. Quite often, we …

both methods in the field. In doing so, we use the criterion of theoretical validity and measure the degree to which WTP … values are consistent with theoretical expectations. In addition, we analyse the test-retest reliability and stability of our …

used without grossly violating the validity of the analysis. We therefore do a simulation study to assess the properties …