CEA, CUA 和CBA三者都用增量比(incremental ratio, IR) ，即两种健康干预成本的差值除以健康结局的差值。表5.1给出了相应的计算公式。
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incremental ratio of specific conductivity 增比电导率
power incremental ratio 功率增量比
strain incremental ratio 应变增量比
ICOR incremental capital-output ratio 资本产出增量比 ; 资本 ; 产出增量比
incremental ratio of consumption 耗量微增率
incremental capital-output ratio 资本 ; 增量资本产出率 ; 递增资本产量比 ; 增量资本产出比
incremental cost-effectiveness ratio 增量成本效果比 ; 效果比值 ; 效果比 ; 增量成本
incremental-benefit-cost ratio 增量效益成本比
incremental cost effectiveness ratio 成本效果比 ; 增量成本效果比
The experimental data available in literature were employed to build the incremental ratio function for relative permeability of two-phase medium.
基于已有的岩心实验数据，构造了振动采油条件下两相介质相对渗透率的变化率函数。
The results indicate that the relationship between stress ratio and strain incremental ratio in these materials is still a linear relation on the extended moblized plane.
结果表明，在扩展强度发挥面上，这几种材料的应力比与应变增量比之间仍具有线性关系。
When the stree strain relationship is the weak hardening, the relationship between stress ratio and strain incremental ratio shows the straight line with two different slopes.
当材料的应力应变关系为弱硬化型时，应力比与应变增量比关系为两段斜率不同的直线；
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