Variance Estimation, Design Effects, and Sample Size Calculations for Respondent-Driven Sampling Hidden populations, such as injection drug users and sex workers, are central to a number of public health problems. However, because of the nature of thes......
The smaller the ICC, the more precise the outcome measure sampling, and the smaller the required sample size (Table 1) (Campbell and Walters, 2014).ρ=σbetween2σbetween2+σwithin2where: Sample size estimation for cluster RCT with unequal cluster sizes The majority of trials tend to have ...
Sample Size for Estimation of Means in Stratified Sampling
Multistage cluster sampling design and optimal sample sizes for estimation of fish discards from commercial trawlers 来自 国家科技图书文献中心 喜欢 0 阅读量: 94 作者:M Allen,D Kilpatrick,M Armstrong,R Briggs,N Pérez 摘要: The fish discards surveys, conducted by Northern Ireland, Spain and ...
And then we use an appropriate estimation procedure when the sample sizes are not equal. For equal sample sizes, let σ2(Y) be the estimand corresponding to σˆ2(Y)=1N−1∑j=1J∑i=1n(Yij−Y¯)2, where Y¯=∑∑Yij/N and N=nJ is the total sample size. Adopting a ...
The specific features of SWTs need to be addressed properly in the sample size calculations to ensure valid estimates of the intervention effect. Methods We critically review the available literature on analytical methods to perform sample size and power calculations in a SWT. In particular, we ...
sample size calculation performed by SCOPIT is distinct from estimation of the number of undiscovered subpopulations [10] or the number likely to be discovered in further sampling [11], and can instead be interpreted as the required sample size of a replicate experiment which would detect the ...
Estimating the necessary sampling size of surface soil moisture at different scales using a random combination method To develop a sampling strategy of surface soil moisture, a random combination method (RCM) was proposed and used to estimate the necessary sampling size (N... C Wang,Z Qiang,R ...
Step-by-step procedures for determining optimal sampling plans are also presented. Several numerical examples are included for illustrative purposes. Keywords: missing or discarded data; guaranteed-coverage and expected-coverage tolerance limits; optimal sampling plans; unconditional and conditional tolerance ...
The estimation step in the E + M approach may be able to generate a flatter tail probability curve, and this may increase the significance level of a test and finally lead to a possible power gain. Shan et al. [89] were the first to extend the E + M approach for the sample size ...