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Among dependency analysis methods, the traditional linear correlation coefficient can only describe the linear dependencies between variables.

相依性分析方法中，传统的线性相关系数只能描述变量间的线性相依关系。

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In practical work, it is frequent that there is power relation among independent variables when the correlation between dependent variable and independent variables is explained by regression model.

在实际工作中，人们在采用回归模型解释因果变量间的相关关系时，经常会遇到自变量之间存在幂乘关系的情况。

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Univariate linear correlation analysis was used for comparison among the variables.

变量间采用单因素直线相关分析。