What is attribute non-attendance?

from Healthcare Economist at http://bit.ly/1AYjNTj on December 29, 2014 at 03:03AM

In discrete choice experiments (DCEs), respondents are asked to choose amoung different options which vary across different attributes. For instance, a DCE on mobile phone preferences could have processor speed, battery life, screen size and cost as attributes. A DCE looking at different treatments could have expected survival, anticipated side effects and cost as attributes. […]