A good sample size really depends on the context and goals of the research. In general, a good sample size is one that accurately represents the population and allows for reliable statistical analysis. Larger sample sizes are typically better because they reduce the likelihood of sampling errors ...
Larger sample sizes obviously produce better, more accurate estimates about populations, but there are several problems with researchers using larger sample sizes. First of all, it may be hard to find a random sample of people willing to try a new drug. When you do, it becomes costlier to p...
Discussion Our findings suggest that most research studies in the field of prosthetics are underpowered. Given the noted difficulty of increasing sample sizes, it seems important to choose comparison variables that promise a large effect size and/or to deliberately reduce the heterogeneity (i.e., ...
Power Analysis and Sample Sizes in Pathology Research 来自 Springer 喜欢 0 阅读量: 23 作者: RT Vollmer 摘要: For decades research in pathology has occurred with little attention paid to the formalities of experimental design and issues of sample size and statistical power. Pathology research ...
So, where does all of that leave us in our goal to manage stakeholder concerns regarding sample sizes in generative design research? We can point to the well-established theoretical foundations that underpin the way that we approach design research. We can also argue with confidence that this ty...
Sample size calculations based on too narrow a width, or with lower and upper confidence limits bounded by fixed cut-off points, not only increase power-based sample sizes to ethically unacceptable levels (thus making research practically unfeasible) but also greatly increase the costs and burdens ...
reliable results or accurately reflect the demographics of the group under study. A sample size that is excessively big, however, may considerably increase the cost and time required to carry out the research, even though higher sample sizes produce reduced margins of error and are more ...
- 《Western Journal of Nursing Research》 被引量: 1发表: 1991年 Intervention in individuals at ultra-high risk for psychosis: a review and future directions. Conclusions: Further controlled intervention trials with larger sample sizes are required in order to confirm and extend these findings. We...
Saturation is the most common guiding principle for assessing the adequacy of purposive samples in qualitative research (Morse, 1995,2015;Sandelowski, 1995). However, guidance on assessing saturation and the sample sizes needed to reach saturation have been vague. Until recently, saturation had not ...
Pilot data from three different microarray experiments are used to extrapolate EDR as well as the related false discovery rate at different sample sizes and thresholds. 展开 关键词: electrical impedance measurement biological tissue air emboli bubble non-invasive detection ...