1) covariance for cluster sampling

整群抽样协方差
2) Cluster sampling

整群抽样
1.
Methods Cluster sampling method was used and the results were analyzed for cultivable bacteria in several representative hospitals of Chengde city from May 1998 to May 2000.
方法采取整群抽样方法,对承德市几家有代表性医院从1998年5月至2002年5月的临床细菌培养结果进行统计分析。
2.
Methods 3299 students in Tongcheng middle and elementary schools were sampled by cluster sampling and some common diseases were investigated.
方法 通过整群抽样对桐城市 32 99名中小学生进行健康检查和常见病的监测。
3.
For stratified and cluster sampling with inappreciable differences, estimate precision becomes poor.
对于分层抽样和整群抽样,当群体间的差异、群内个体间差异均不显著时,其估计精度往往都很差。
3) Sampling variance

抽样方差
1.
By the derivations and comparisons of Sampling Variance formulas under the different Sampling Methods,it is proposed that Sampling Method depend upon two parameters:heteroskedasticity r and intercept α.
本文通过对不同抽样方法下抽样方差计算公式的导出与比较,认为抽样中应采用何种抽样方法取决于两个参数异方差测度r和回归截距项α,并提出了这两个参数的事前估算方法。
4) cointegration approach

协整方差
5) multiple-stage cluster sampling

多阶段整群抽样
6) adaptive cluster sampling

适应性整群抽样
1.
On two stage adaptive cluster sampling to assess pest density;

应用二阶适应性整群抽样估计害虫密度
补充资料:整群抽样
分子式:
CAS号:
性质:将总体中各单位划分为若干群,从各群中随机抽取整群样品,例如,调查中学生患近视眼的情况,抽某一个班做统计;进行产品检验;每隔8h抽1h生产的全部产品进行检验等。整群抽样的优点是抽样方法简便,缺点是抽取的样本在总体中分布不均匀,代表性差。
CAS号:
性质:将总体中各单位划分为若干群,从各群中随机抽取整群样品,例如,调查中学生患近视眼的情况,抽某一个班做统计;进行产品检验;每隔8h抽1h生产的全部产品进行检验等。整群抽样的优点是抽样方法简便,缺点是抽取的样本在总体中分布不均匀,代表性差。
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参考词条