The coefficient Ma thus defined is termed the force of mortality at age a From its definition it is clear that it measures the death rate per head in a population composed entirely of individuals of a
因此，所定义的Ma系数被称为年龄为a时的死亡率。从其定义可以清楚地看出，它衡量的是完全由年龄为a的个体组成的人口中的每个人的死亡率。
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