Algina James, Olejnik Stephen
University of Florida, USA.
Eval Health Prof. 2003 Sep;26(3):288-314. doi: 10.1177/0163278703255248.
Researchers are frequently asked to justify the sample size used in their quantitative inquiries. Such a justification can be provided through a power analysis. Conducting power analyses, however, can raise some difficult issues regarding the specification of the size of the effect, testing for interaction effects, the role of covariates, and the use of an estimated effect size in the power analysis. The authors present methods for conducting power analyses along with a discussion of these issues, and they make available SAS programs that can be used to implement the power analyses that are discussed.
研究人员经常被要求说明其定量研究中所使用的样本量的合理性。这种合理性可以通过功效分析来提供。然而，进行功效分析可能会引发一些关于效应大小的设定、交互效应检验、协变量的作用以及在功效分析中使用估计效应大小等难题。作者介绍了进行功效分析的方法以及对这些问题的讨论，并提供了可用于实施所讨论的功效分析的SAS程序。
