Modelling for economic evaluation of health-care data has received much attention in both the health economics and the statistical literature in recent years (Briggs et al., Decision modelling for health economic evaluation. Oxford University Press, 2006; Willan et al., The statistical analysis of cost-effectiveness data. Wiley, 2006), increasingly often under a Bayesian statistical approach (Baio, Bayesian methods in health economics. Chapman Hall/CRC Press, 2012; O’Hagan et al., Stat Med 20:733–753, 2001; O’Hagan and Stevens, Health Econ 10:303–315, 2001; Spiegelhalter et al., Bayesian approaches to clinical trials and health-care evaluation. Wiley, 2004).