样本含量(sample size)即观察单位数,又称样本大小。在保证研究结论具有一定可靠性(精确度和检验效能)的前提下,常需要在设计阶段就认真估计最少的受试对象数。正确估计样本含量是实验设计的一个重要组成部分。样本含量估计充分反映了实验设计中“重复”的基本原则,过小过大都存在弊端。 Sample size (sample size) that the number of units of observation, also known as sample size. It is often necessary to carefully estimate the minimum number of subjects at the design stage, with the assurance of certain reliability (accuracy and test performance). Correctly estimating the sample content is an important part of the experimental design. The sample content estimation fully reflects the basic principle of “repeated” in the experimental design. If the sample size is too small, there are disadvantages.