Errors in the Estimation of Net Migration Rate in the Studies of Internal Migration
国内迁移研究中净迁移率估计的误差AI 解读 ↓
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国内迁移研究中净迁移率估计的误差AI 解读 ↓
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The effect of relaxing the conditions regarding the equality of the mortality rates and of the errors of enumeration between the states and the nation, on the error in the estimation of the net migration rate by the census survival ratio method, is examined and it is shown that, when the national population is closed, the necessary and sufficient condition for this error to become zero is that the relative degree of enumeration for any age x of a given sex in the ith state as compared with the degree of enumeration in the nation at the first census bears the same ratio to the relative degree of enumeration for the same cohort at age (x + n) at the second census, as the survival ratio of that cohort from age x to (x + n) in the ith state bears to the corresponding survival ratio in the nation as a whole.