【摘要】 本文讨论了非独立计量资料中因变量的协方差结构和内部相关性。在忽略类间相关的情况下，分别给出了不考虑协变量和考虑协变量时内部相关的计算方法和步骤。实例分析表明，混杂因素对内部相关有较大的影响，只有合理地构造协方差结构，才能得到合理的、不含混杂的内部相关。更多还原

【Abstract】 In this paper we discussed the variance-covariance matrix and the intra-unit correlation for dependent date. Intra-unit correlation with and without covariates were considered. An example of family data showed that the intra-unit correlation was influenced by confounding factors in some degree. A reasonable and explainable intra-unit correlation without confounding would be obtained if and only if areasonable and explainable covariance matrix was constructed更多还原