cofficient of variation

例句：

1. 1. The coefficient of variation is ameasure of how much the data deviates from the mean.
   变异系数是衡量数据与均值偏离程度的指标。
2. 2. The coefficientof variation is used to calculate the standarddeviation of a sample.
   变异系数用于计算样本的标准差。
3. 3. The coefficient of variation can beused to compare the variability of different datasets.
   变异系数可以用来比较不同数据集的变异性。