Power and sample size formulae are given.doi:10.1111/1467-9884.00078Henry C. ThodeJohn Wiley & Sons, LtdJournal of the Royal Statistical Society: Series D (The Statistician)Thode, H. C. (1997). "Power and Sample Size Requirements for Tests of Differences Between Two Poisson Rates," The ...
Building on the recent literature for calculating confidence intervals for cost-effectiveness ratios, the authors explore possible techniques for deriving a sample size formula for cost-effectiveness analysis based on simple combination of the confidence limits on costs and effects. 展开 关键词: cost-...
Methods of sample size and power calculations are reviewed for the most common study designs. The sample size and power equations for these designs are shown to be special cases of two generic formulae for sample size and power calculations. A computer program is available that can be used for...
The widely-used sample size formula for the comparison of two normally distributed endpoints in two independent groups of patients is based on a t-test. It has been recently highlighted that this formula was inadequate in the IRT setting [11]. In randomized clinical trials, Holman et al. [12...
Power and Sample Size (StatPrimer Draft) To achieve meaningful results, statistical studies must be carefully planned and designed. Study design has many aspects. Here’s just a sampling of questions you must ask yourself when planning a study: � How will the research question be operationalize...
The sample size and power equations for these designs are shown to be special cases of two generic formulae for sample size and power calculations. A computer program is available that can be used for studies with dichotomous, continuous, or survival response measures. The alternative hypotheses ...
Thus, using this classical formula, the sample size required when a Rasch model is used has to be increased to reach the desired power of 1-β (i.e. Ng has to be increased). Figure 1 Description of the whole procedure for power and sample size determination using the ratio with the ...
Sample size formulae and the corresponding examples are discussed according to the six types of studies ; mean for one sample, proportion for one sample, means in two samples, proportions in two samples, correlation coefficient and ... JW Lee,MR Park,JB Lee,... 被引量: 2发表: 1998年 Ra...
"Exact and approximate power and sample size calculations for analysis of covariance in randomized clinical trials with or without stratification" by Yongq... Tang (2018b,a) derived the exact power formulae for t tests and analysis of covariance (ANCOVA) in superiority, noninferiority and equival...
In this article power calculations and sample size based on power are discussed and illustrated for the three most frequently used tests of this type. Available noncentrality parameters and existing tables permit a relatively easy solution of these kinds of problems. DOI: 10.1080/00031305.1977....