n.（数学）协方差；协变性；共离散

The covariance between the two variables is positive, indicating they tend to move in the same direction.
两个变量之间的协方差为正，表明它们倾向于同向移动。
They calculated the covariance matrix to analyze the relationships among different stock returns.
他们计算了协方差矩阵来分析不同股票回报率之间的关系。
A low covariance suggests that one variable does not have much influence on the other.
低的协方差表明一个变量对另一个变量的影响不大。
In finance, the covariance of an asset with the market portfolio indicates its riskiness.
在金融学中，资产与市场组合的协方差表示其风险性。
The covariance of stock prices and interest rates can help predict future economic trends.
股票价格和利率之间的协方差有助于预测未来的经济趋势。
They used the sample covariance to estimate the population covariance for their statistical analysis.
他们在统计分析中使用样本协方差来估计总体协方差。
High covariance between inflation and unemployment is often seen during periods of economic recession.
高度的相关性（即高协方差）在经济衰退时期常常出现在通货膨胀和失业之间。
By analyzing the covariance of weather patterns, meteorologists can make more accurate predictions.
通过分析天气模式的协方差，气象学家可以做出更准确的预报。
The covariance between exam scores and study hours may reveal whether extra effort leads to better results.
考试成绩和学习时间之间的协方差可能揭示额外的努力是否能带来更好的结果。
In machine learning, the covariance matrix is a crucial component in dimensionality reduction techniques like PCA.
在机器学习中，协方差矩阵是主成分分析等降维技术中的重要组成部分。