Secondly , we construct the sequential confidence intervals for the common number characters : coefficient of variation , skewness and kurtosis , stressing on computing their asymptotic variances in their limiting distributions 其次,我們就常用的數(shù)字特征變異系數(shù)、偏度和峰度分別建立了它們的序貫置信區(qū)間程序,著重算出它們極限分布中的相關(guān)漸近方差。