Mehrez A, Gafni A
Department of Industrial Engineering and Management Faculty of Engineering Sciences, Ben Gurion University of the Negrev, Beer-Sheva, Israel.
Soc Sci Med. 1990;31(11):1281-3. doi: 10.1016/0277-9536(90)90137-h.
A commonly used method of measuring cardinal preferences for the purpose of evaluating health related quality of life is the time trade-off (TTO) technique. The TTO technique, although offered as a substitute to the standard gamble (SG) technique, is not related in a general way to any existing behavioral theory. We suggest that in the context of value function theory the TTO technique is a method which enables us to identify different points on an individual's indifference curve in his evaluation space. Creating a formal theoretical foundation for the TTO technique enables us to better understand and interpret the outcome of our measurements. We show, for example, that the current way of calculating the value preference of a given health state assumes a very specific set of specific set of value functions. This assumption has not been validated in empirical studies and thus casts doubt upon the interpretation of these values as being the value preferences of individuals for these health states.
一种用于评估健康相关生活质量以测量基数偏好的常用方法是时间权衡（TTO）技术。TTO技术虽然被作为标准博弈（SG）技术的替代方法提出，但一般而言与任何现有的行为理论都没有关联。我们认为，在价值函数理论的背景下，TTO技术是一种使我们能够在个体评估空间中的无差异曲线上识别不同点的方法。为TTO技术建立正式的理论基础能够使我们更好地理解和解释测量结果。例如，我们表明，当前计算给定健康状态价值偏好的方式假定了一组非常特定的价值函数。这一假设尚未在实证研究中得到验证，因此对将这些值解释为个体对这些健康状态的价值偏好提出了质疑。
