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现有卫生统计资料既不同于按随机抽样原则获得的调查资料,也不同于有随机分组的实验设计资料。因此,在开发和利用现有卫生统计资料时应注意以下几点。 1.由于现有卫生统计资料大多是全面调
The existing health statistics are different from the survey data obtained by the random sampling principle and are also different from the experimental design data with random groups. Therefore, the following points should be noted when developing and using existing health statistics. 1. Because most of the existing health statistics are comprehensive