Attema, Arthur E.; Brouwer, Werner B. F. - In: Health Economics 17 (2008) 7, pp. 877-885
The TTO-method is often used to value health states, but it is susceptible to several biases and methodological difficulties. One of these is a violation of procedural invariance, which means that the way a TTO-question is framed, i.e. either by fixing the period in imperfect health or that in...