协方差除以方差得出什么

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如题 一篇文章采用这种方法进行回归方程的解释 原文 我实在搞不懂什么意思了。。。
Finally, we assess the economic impact of each of our incentive variables on firm risk/policy by computing the change in the measure of firm risk/policy expressed in terms of its standard deviation for a one standard deviation change in the incentive variable of interest. For CEO delta and CEO vega, we multiply the coefficient on the incentive variable by its standard deviation to obtain the change in firm risk/policy. We then divide this change by the standard deviation of the firm risk/policy variable in the relevant regression sample to compute economic significance.

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关键词：协方差 significance coefficient regression Deviation computing expressed economic interest standard

相关系数

两个变量的协方差除以他们的方差乘积的算术平方根等于这两个变量的线性相关系数

回归系数