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样本量分配
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  “样本量分配”译为未确定词的双语例句
     There are three main methods to allocate samples to every stratum: proportionate allocation, optimum allocation and Neyman allocation.
     样本量分配方法主要有等比例分配、最优分配和内曼分配。
短句来源
     The paper compares the three kinds of methods and, according to the characteristics of watt-hour meter in use stratified sampling, considers Neyman allocation as the appropriate method.
     论文对比分析了以上的三种方法,根据在线电表分层抽样的特点,选定内曼分配为合理的样本量分配方法。
短句来源
     When we use a randomized design for a fixed sample size,the number of patients assigned to each treatment is a random variable,therefore the power of a randomized design with a fixed sample size is also a random variable. It is necessary to study the power and sample sizes of randomized designs.
     当使用随机化设计时,对于固定的样本量分配到各个组的病人数是一个随机变量,因此随机化设计的势函数对于固定的样本量也是一个随机变量,有必要对随机化设计的势和样本量进行深入的研究。
短句来源
     We give the formulas of optimum allocation of the sample sizes of the sample estimate in multi-stage sampling with unequal probabilities and the proportional allocations of sample sizes in the second to ( n )-th sampling under the cost functionn c=∑ni=1c i·m i .
     在给定的费用函数下,当各阶段不等概抽样样本量分配为等比例分配时,讨论n阶段不等概抽样样本量选择的问题,并给出了一般结果.
短句来源
     In this paper,by introducing into five parameters which are stratified characters,the number of strata L,stratified boundary,sample size assignment of each stratum and sampling strategy inside stratum,and through reconfiguring them and analyzing their theory simply,we improve the technology of stratified sampling.
     通过引进分层特征、层数L、分层边界、各层样本量分配、层内抽样策略5个分层抽样参数,并对其进行重新配置和简单理论探讨,实现对分层抽样技术的改进。
短句来源
  相似匹配句对
     2. Allocation of samples in the strata.
     二、样本在层中的分配
短句来源
     The Estimation of Sample Size
     样本估计
短句来源
     Increase the sample deal to the best;
     尽增加样本;
短句来源
     The Power and Sample Sizes and the Optimal Allocation of Randomized Designs in Clinical Trials
     临床试验随机化设计的势与样本以及最优分配
短句来源
     Mathematical Modeling for Cooperators Research Computation
     科研分配的数学模型探讨
短句来源
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  sample allocation
Optimal training sample allocation and asymptotic expansions for error rates in discriminant analysis
      
The optimal training sample allocation minimizing the asymptotic expected error regret is found in the cases of widely applicable, positively skewed distributions (Rayleigh and Maxwell distributions).
      
Sample design and sample allocation methods are developed for random digit dialling in household telephone surveys.
      
A weighted probability proportional to size sample allocation technique is used, with auxiliary variables about the telephone coverage rates, within local telephone exchanges of each substrata.
      
A simulation study has shown greater sample allocation gain by the weighted probabilities proportional to size measures over other sample allocation methods.
      
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We give the formulas of optimum allocation of the sample sizes of the sample estimate in multi-stage sampling with unequal probabilities and the proportional allocations of sample sizes in the second to ( n )-th sampling under the cost functionn c=∑ni=1c i·m i .

在给定的费用函数下,当各阶段不等概抽样样本量分配为等比例分配时,讨论n阶段不等概抽样样本量选择的问题,并给出了一般结果.

Objective: A generalized non-central procedure is proposed for covering censorship. It is derived from its classical counterpart and appllied in determining the sample size required in the poly-sample survival rate test. Methods: The first step inherites the classical procedure for determining the required homogenetic effective sample size based on existing tables of the non- central chi square distribution and expression for the non-centrality parameter of the classical r × 2 chi square statistic. The second...

Objective: A generalized non-central procedure is proposed for covering censorship. It is derived from its classical counterpart and appllied in determining the sample size required in the poly-sample survival rate test. Methods: The first step inherites the classical procedure for determining the required homogenetic effective sample size based on existing tables of the non- central chi square distribution and expression for the non-centrality parameter of the classical r × 2 chi square statistic. The second step yields the required sample size at a given censoring rate, which is operated inversely from the parametric expression of the homogenetic effective sample size under Weibull survival distributions. The sample allocations are realized by the item-by-item iteration. Results: By contrast with the existing procedures for sample size determination adjusted censoring, the procedure has such characteristics as that it is matched with the poly-sample survival rate test, that it is free from the assumption of exponential distributions, that it reduces to its classical counterpart when there is no censoring, and that the observed power of the test coincides with the prescribed power. Conclusion: The procedure can be applied to planning poly-sample clinical cancer studies. A worked example illustrates the planning process.

目的:本文提出一种广义非中心法以适应终检.它由经典非中心法衍变而来,用于多样本生存率检验所需样本量的测定.方法:其第1步继承经典方法。按已有的非中心卡方分布表和经典r×2卡方统计量非中心参数表达式得出所需同源有效样本量;第2步由同源有效样本量在Weibull生存分布下的参数表达式按预定终检率反推出所需样本量,并以逐个迭代实现样本量的分配.结果:与已有的校正终检样本量测定方法相比,该方法的特点是,与多样本生存率检验相匹配;摆脱了指数分布的假设;在无终检时还原为经典方法;其观测功效和预定功效精确吻合.结论:该方法可用于多样本癌症临床研究方案的设计.附有工作实例描述设计过程.

Objective This paper concerns the determination of the required sample size for multi-center two-group clinical trials. Methods The required total sample size is derived inversely from the Cochran test or the Mantel-Haenszel test and allocated into each stratum and each group in the light of the relevant sample fractions. Results The procedures are certainly matched with the tests respectively. They possess the property of homogeneity and reduce to the procedure of simple normal assuming homogeneity or that...

Objective This paper concerns the determination of the required sample size for multi-center two-group clinical trials. Methods The required total sample size is derived inversely from the Cochran test or the Mantel-Haenszel test and allocated into each stratum and each group in the light of the relevant sample fractions. Results The procedures are certainly matched with the tests respectively. They possess the property of homogeneity and reduce to the procedure of simple normal assuming homogeneity or that plus one when there is only one stratum. The procedure derived from the Cochran test can be used for the designs with equal-or unequal-sized strata but the procedure derived from the Mantel-Haenszel test only for the designs with equal-sized strata. Conclusion The procedures proposed can be applied to planning multi-center two-group clinical trials. A worked example illustrates the planning process.

目的 提出用于多中心两组临床试验的样本量测定方法。方法 由Cochran检验或Mantel Haenszel检验反推得出所需总样本量 ,按层样本分数和组样本分数进行样本量的分配。结果 如此获得的样本量测定方法与检验方法一一匹配。该方法具有同质性 ,当只有一层时还原为同质假设下的简化正态法或同质假设下的简化正态法加 1。针对Cochran检验的设计可为等层或非等层设计 ,而针对Mantel Haenszel检验的只能是等层设计。结论 该方法可用于多中心两组临床试验方案的设计。附有工作实例描述设计过程

 
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