【摘要】 本文首先推导出不连序系列方差的无偏估计公式，然后提出一个估算ＣＶ的改进公式．许多实例说明改进的公式比现行的克－闵公式精确．更多还原

【Abstract】 This paper, at the very start, derives the formula of unbiased estimate variance in nonsequential sequence,and then recommends an improved formual for calculating Cv.Many twpical example. verify that the formula is more exact than the conventional K-M formula in its application.更多还原