Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

Sample Size Neglect is a cognitive bias studied by Amos Tversky and Daniel Kahneman. It consists of drawing false conclusions from statistical information, due to having not considered the effects ...

Quality of Life Research, Vol. 24, No. 1, Special Section: Quantitative Methods (January 2015), pp. 147-151 (5 pages) Purpose To provide guidance regarding the desirable size of pre-tests of ...

Sample size substantially affects power in our example. If we average seven measurements (n = 7), we are able to detect a 10% increase in expression levels (μA = 11, d = 1) 84% of the time with ...

All the points are inside the control limits, indicating that the process is in statistical control. Since there is relatively little variation in the sample sizes, the control limits in Output 38.3.3 ...

I don't understand why they are using this method of calculating their sample size. I'm told if I use this I should start off with 5, 95 and 50 in the first, second and fourth boxes at the top.

Qin Zhou, Changliang Zou, Zhaojun Wang, Wei Jiang, Likelihood-Based EWMA Charts for Monitoring Poisson Count Data With Time-Varying Sample Sizes, Journal of the American Statistical Association, Vol.