Methods With the equal proportion sampling, 5,489 elementary and middle school students were selected to test the visual acuity and a questionnaire survey was conducted among them.
方法采用等比抽样法对宝鸡市5 489名中小学学生进行了视力测试和问卷调查。
Under simple random sampling scheme without replacement and unknown proportion of population possessing neutral attribute, the optimal allocation of sizes of two sub-samples is given.
对简单随机不放回抽样，在总体非敏感属性个体比例未知的情况下，给出了两个子样本容量的最优配置。
Comparing the different sampling proportion, the core collection of sampling proportion 50% with higher CV, VAR and RPR was the best than others.
比较不同聚类压缩的预选核心种质，综合进行评价后最终确定聚类压缩50%为核心种质的最佳取样比例。
Comparing the different sampling proportion, the core collection of sampling proportion 50% with higher CV, VAR and RPR was the best than others.
比较不同聚类压缩的预选核心种质，综合进行评价后最终确定聚类压缩50%为核心种质的最佳取样比例。
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