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. 2023 Apr;43(3):362-373.
doi: 10.1177/0272989X221145048. Epub 2022 Dec 24.

A Comparison of Ordered Categorical versus Discrete Choices within a Stated Preference Survey of Whole-Blood Donors

Zia Sadique  1 , John Cairns  1 , Kaat De Corte  1 , Sarah Willis  1 , Alec Miners  1 , Nick Bansback  2 , Richard Grieve  1
Affiliations

A Comparison of Ordered Categorical versus Discrete Choices within a Stated Preference Survey of Whole-Blood Donors

Zia Sadique et al. Med Decis Making. 2023 Apr.

Abstract

This article compares the relative preferences from stated preference (SP) questions requiring ordered categorical versus discrete choice responses. The approaches were contrasted for blood donation service characteristics that offer opportunities to donate blood.The estimates of relative preferences for alternative blood donation service characteristics were similar between the 2 forms of SP approach.This study illustrates how SP survey questions can be formulated to provide responses on an ordered categorical scale and to estimate marginal rates of substitution between different attributes, which can be compared with those derived from discrete choice experiment (DCE) choices.The article highlights the potential value of considering alternative choice framings rather than relying solely on DCEs.

Keywords: blood donation; discrete choice experiments; stated preferences.

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Conflict of interest statement

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. The authors disclosed receipt of the following financial support for the research, NIHR HS&DR 13/54/62 (ZS, JC, SW).

The data that support the findings of this study were made available by NHSBT. Restrictions apply to the availability of these data, which were used under a data-sharing agreement for this study.

Figures

Figure 1
Figure 1
(a) Example of a stated preference–ordered categorical survey question. (b) Example of a discrete choice experiment survey question.
Figure 2
Figure 2
(a) Marginal rates of substitution from SP-ordered categorical and DCE survey responses for 4,754 males. (b) Marginal rates of substitution from SP-ordered categorical and DCE survey responses for 4,179 females. DCE, discrete choice experiment; SP, stated preference.
See this image and copyright information in PMC

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