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Abstract：
Calculation 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.
摘要：
样本量的计算是研究设计的重要组成部分，因为它影响到研究的可靠性和可行性。在这篇文章中,我们看看不同类型研究的样本量计算原则。
