The total number of clusters, drawn from a list of all sections and their population estimates, is divided by 30 to obtain the cluster interval K.
从所有的区域和它们的估计人口列表中得到总分组数，再将总分组数除以30得到分组抽样间隔k。
PLS partitions the population into a group of disjoint subpopulations by cluster analysis, then USES simplex method to search local optima in each subpopulation in parallel.
PLS算子通过聚类分析将种群分割为互不相交的邻域子种群，对每一个子种群应用单纯形法进行并行局部搜索。
Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
方法对社区人群采用多阶段分层整群随机抽样方法抽取研究对象，进行个案调查和血清学检测。
Variance analyses indicate the cluster intensity of this population is significant difference between the upper and lower crowns of citrus trees.
方差分析表明该种群的聚集强度在树冠的上、下部间差异显著。
The survey included 140 homes, drawn from the five major urban population centres and eight cluster sites throughout the country.
调查包括在全国五个主的人口中心和八个聚居地点抽取一百四十名家庭进行调查。
On the basis of this, we apply the population synthesis method based on star cluster integrated spectra to some BCGs optical spectra.
在此基础上，我们运用恒星团星族合成方法，分析了一些蓝致密星系的光学谱。
Genetic distances of each pair of lines are calculated by Nei's method. The results of cluster by method UPGMA show that the population has less over presentation.
对各株系间的根井遗传距离采用UPGMA法对群体进行聚类分析表明群体中很少存在代表性重复现象。
According to the data of RAPD and ISSR molecular markers of the leaf samples, UPGMA cluster was made at population level and individual level.
分别依据古银杏叶片样品的RAPD和ISSR标记数据，进行了群体和单株聚类分析。
Methods Random sample were obtained from the whole population by multiple stratified cluster and 1 320 objects were surveyed in their own homes by questionnaires.
方法采用多阶段整群抽样和配额抽样相结合的方法，对深圳市1 320名居民进行入户问卷调查。
Methods Random sample were obtained from the whole population by multiple stratified cluster and 1 320 objects were surveyed in their own homes by questionnaires.
方法采用多阶段整群抽样和配额抽样相结合的方法，对深圳市1 320名居民进行入户问卷调查。
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