样本含量

样本含量的估算是临床试验设计时最重要的问题之一。

Sample size estimation is one of the most important issues at the clinical trial design stage .

样本含量n对正态分布数据和Poisson分布数据有不同的含义。

There is different meaning of sample size " n " between Poisson and normal data .

Poisson分布数据正态近似分析中的样本含量问题

The Determination of Sample Size for Analysis of Poisson Data Using Normal Approximation

Poisson分布设计时样本含量的估算

Sample size determination for the Poisson distribution

本文对Poisson分布数据作正态近似分析时所需样本含量的决定，作一些探索和讨论。

This paper contributes to probing and discussing on the determination of sample size in statistical analysis for Poisson data .

生存分析log-rank检验和Cox回归样本含量估计研究

The Sample Size Calculations for Log-rank Test and Cox Regression in Survival Analysis

但是，无论资料中零计数比例如何，Hurdle模型要想获得理想的参数估计结果，仍需要有足够的样本含量为前提。

However , no matter how the ratio of zero count , in order to get a good parameter estimation in Hurdle model , sufficient sample size is necessary .

模拟试验结果表明：个体数和测定日密度对动态性状QTL的分析和检测具有几乎相同的作用，而且在相同样本含量条件下两者呈现互补的关系；

It showed that the individual number and test-day density with almost same effect on QTL analysis and detection , and showed complementation with each other in same sample size .

Meta分析可通过统计学方法对收集的多个研究资料进行分析和概括，通过增大样本含量来增加结论的可信度。

Meta analysis can summarize a number of research data together , and give results based on these studies , so the conclusions would be more reliability for the sample size is enlarged .

本文提出了配对计数资料的tc检验法，以克服配对四格表卡方检验中未考虑样本含量之缺欠。

A statistic tc was proposed to test the hypothesis applied to the paired enumeration data , in order to overcome the defect of McNemar 's chi square statistic , which did not consider the sample size .

方法：以离散性Markov链拟合生存过程，据此计算log-rank统计量的数学期望和方差，导出样本含量估计公式。

Methods : The survival process was modeled by discrete Markov chain and the asymptotic expectation and variance of log-rank statistics were calculated thereafter . The sample size formula was thus derived .

在两样本含量均较大时，t检验、u检验、Satterthwaite法，Cochran-cox法和Wilcoxon秩和检验等方法相互替代是可行的。

When sample size is large enough , Mest , u-test , Satterthwaite method , Cochran-cox method and Wilcoxon rank-sum test are all recommended .

根据概化理论，拟合两因子多元概化模型，探讨OSCE及其分测验的可靠性，同时考察各分测验样本含量的变化对各自测验信度和全域合成总分测量可靠性的影响。

Multivariate Generalizability Theory was used to estimate the overall reliability of the examination , the reliability of the two subtests and their respective contributions to overall reliability .

这是由于Fas的样本含量多于PPS，PPS中脱落病例的原因为使用对照药无效，患者要求改为中药治疗。

This is because that the samples of FAS were more than PPS . The reason for PPS samples ' leave was the drugs ineffective of controlled groups , hence the patient asked to treat by traditional Chinese medicine . 2 .

本文结合超几何概率分布，二项分布和poisson分布，应用实例进行了讨论和介绍。Poisson分布数据正态近似分析中的样本含量问题

This paper introduces and discusses this problem by combining the three important distributions ( viz : hypergeometric probability distribution , binomial distribution and poisson distribution ) with some practical examples . The Determination of Sample Size for Analysis of Poisson Data Using Normal Approximation

以Cpk为例，对不同分布类型、参数和样本含量的组合进行了大量仿真，确定了不同样本含量下最优Bootstrap置信下限的计算方法。

With Cpk as a sample , the reliability of different Bootstrap lower confidence limits are research by a great deal of simulations with different distribution , parameter and sample size . The best Bootstrap method is confirmed in case of different sample size .

样本含量分别为20、59和57；

The sample content respectively was 20 , 59 and 57 ;

多组均数比较的样本含量估计

Estimation of sample size for comparing more than two treatment groups

非劣性/等效性试验的样本含量估计及统计推断

Sample size estimation and statistical inference in noninferiority / equivalence trials

在个体内变异小于0.2时，可以采用估计法进行样本含量的估计；

When , estimation method is feasible in estimating sample size .

没有1篇提到样本含量估算依据；

None of the papers mentioned the sample size estimation evidence ;

探讨药物临床试验中样本含量及相关问题

Discussion on the sample size in clinical trial and its related problems

病例对照研究评价疫苗效力的样本含量

Sample Size Determination for Estimating Vaccine Efficacy in Case-control Study

病例对照研究设计中优化样本含量的估计

Determining the Optimal Sampling Size in Case - control Study

出生缺陷监测中O/E法的样本含量估算

^ Sample Size of O / E Scheme in Birth Defects Monitoring

论文存在问题较多的是科研设计方法和样本含量。

The problems are the methods of scientific design and sample coverage .

病例对照家系设计中样本含量的估算

Sample Size Estimation for Case - control Family Design

临床随访研究中样本含量的估计

Estimation of sample size needed in clinical follow-up study

基于置信区间宽度的样本含量估计

Sample size estimation based on width of confidence interval

无一篇文献有病例筛选记录，均没有进行事前样本含量的估算。

No literature has filtered record nor conducted prior estimation of sample size .