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CFA 学习笔记 协方差

  • 2026-03-05 08:05:02
CFA 学习笔记 协方差

CFA 学习笔记 协方差


核心词汇

- Covariance 协方差
- Sample covariance 样本协方差
- Population covariance 总体协方差
- Covariance matrix 协方差矩阵
- Positive covariance 正协方差
- Negative covariance 负协方差
- Zero covariance 零协方差

常一起考的关联词

- Correlation 相关系数
​
- Correlation coefficient 相关系数
​
- Variance 方差
​
- Standard deviation 标准差
​
- Portfolio variance 投资组合方差

1. 相关 = 协方差 ÷ 两个标准差
2. 协方差 = 相关 × 两个标准差
3. 组合方差：平方和 + 2倍权重乘积×协方差

 

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  1. CONNECT:[ UseTime:0.000848s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001563s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000739s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000687s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001367s ]
  6. SELECT * FROM `set` [ RunTime:0.000599s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001516s ]
  8. SELECT * FROM `article` WHERE `id` = 471662 LIMIT 1 [ RunTime:0.000904s ]
  9. UPDATE `article` SET `lasttime` = 1772698654 WHERE `id` = 471662 [ RunTime:0.026931s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.005461s ]
  11. SELECT * FROM `article` WHERE `id` < 471662 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001110s ]
  12. SELECT * FROM `article` WHERE `id` > 471662 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002291s ]
  13. SELECT * FROM `article` WHERE `id` < 471662 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002368s ]
  14. SELECT * FROM `article` WHERE `id` < 471662 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001502s ]
  15. SELECT * FROM `article` WHERE `id` < 471662 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003695s ]
0.204582s