title: Effects coding in discrete choice experiments.
abstract: This paper discusses the inherent problems associated with applying dummy coding when including a fixed comparator in a discrete choice experiment, and seeks to illustrate the misinterpretations that may arise if the analyst is not aware of the problem. This note provides two examples of possible misinterpretations with dummy coding and how it is solved with the use of effects coding.
authors.affiliation: University of Southern Denmark, Institute of Public Health, Odense C, Denmark. mbe@sam.sdu.dk
authors.forename: Mickael
authors.initials: M
authors.lastname: Bech
authors.forename: Dorte
authors.initials: D
authors.lastname: Gyrd-Hansen
mesh_terms: D002755:Choice Behavior; D003627:Data Interpretation, Statistical; D003695:Delivery of Health Care / Q000706:statistics & numerical data; D003718:Denmark; D005568:Forms and Records Control / Q000706:statistics & numerical data*; D012044:Regression Analysis