action sub-coefficient

例句：

1. 1.The coefficient of variation is used to measure the amount of variation in a dataset.
   变异系数用于衡量数据集中的变异程度。
2. 2. The coefficient of determination explains how much variation is due to random error and how much is due to true effects.
   决定系数解释了随机误差和真实效应各占多少比例。
3. 3. The coefficient of correlation measures the strength of the relationship between two variables.
   相关系数衡量两个变量之间的关联强度。