Filko, M.

utility health utility independence independence probability model qaly model state health states preference journal prospect sequence bleichrodt theory marginality subject difference decision economic filko / journal result condition sequence invariance function wakker gandjour level gafni invariance measurement choice outcome indifference  i ixi miyamoto interval value period probability p table theorem violation spencer problem filko additive study method press experiment paper fi ndings management science question health state fi rst example support multiattribute conjoint measurement elicitation iteration constituent health states uncertainty tversky robinson conjoint research iteration process science number heuristic 1237–1249 analysis observation proof elicitation method nding utility model