sample sizeCalculation of sample size is an essential part of research study design since it affects the reliability and feasibility of the research study. In this article, we look at the principles of sample size calculation for different types of research studies.Priya Ranganathan...
Although sample size calculation methods for pilot studies have been proposed, none of them are directed at the goal of problem detection. In this article, we present a simple formula to calculate the sample size needed to be able to identify, with a chosen level of confidence, problems ...
The sample size is the number of patients or other experimental units that need to be included in a study to answer the research question. Pre-study calculation of the sample size is important; if a sample size is too small, one will not be able to detect an effect, while a sample tha...
we also need a specific sample size calculation method for a specific research objective. Even if two research objectives may require a similar statistical analysis, the sample size might be different depending on the parameters that we use for the calculation. In this paper, we focus on the ob...
A sample size calculation for logistic regression involves complicated formulae. This paper suggests use of sample size formulae for comparing means or for... FY Hsieh,DAB And,MD Larsen - 《Statistics in Medicine》 被引量: 1227发表: 1998年 Sample Size Calculations in Clinical Research Sample si...
Stepped wedge trials (SWTs) are a variant of CRTs where all clusters receive the intervention in a randomised order. They also have additional features which need to be formally taken into account in the sample size calculations, including: the number of crossover points; the number of clusters...
* II. Determination of sample size: Qualitative studies There are no fixed rules for sample size in qualitative research. The size of the sample depends: on what one is trying to find out from what different respondents or perspectives one tries to find that out for example, the number of ...
Analytic results of sample size calculations from the two methods with Weibull distributed survival times are briefly compared using an example of a clinical trial on cholangiocarcinoma and are verified through simulations. Our simulations suggest that in the case of small sample phase II studies, ...
Sample size calculation, which is important in clinical research, was also not reported.45 The GRADE rating for the assessment of articulation disorders and acoustic parameters in maxillary and mandibular FCD users in the included studies was very low, indicating the need for further well-designed ...
42% of R01s examined in one review paper were criticized for the sample size justifications or analysis plans.1 Much more involved than a cut-and-paste paragraph.1Inouye & Fiellin, “An Evidence-Based Guide to Writing Grant Proposals for Clinical Research”, Annals of Internal Medicine, 142.4...