Fundcd | ys | stkcd | _000024 | _000063 | _000069 | _000090 | _000157 | weight |
000021 | 20071 | 000024 | 0.060806671 | -0.002368405 | 0.05729196 | 0.0295568 | 0.028014667 | 0.020612424 |
000021 | 20071 | 000063 | -0.002368405 | 0.004893374 | 0.001728497 | 0.003426467 | 0.004958114 | 0.015556568 |
000021 | 20071 | 000069 | 0.05729196 | 0.001728497 | 0.065656735 | 0.028710844 | 0.042373893 | 0.012821029 |
000021 | 20071 | 000090 | 0.0295568 | 0.003426467 | 0.028710844 | 0.027492132 | 0.017054568 | 0.014140677 |
000021 | 20071 | 000157 | 0.028014667 | 0.004958114 | 0.042373893 | 0.017054568 | 0.035384138 | 0.017985457 |
请问我如何编程计算整个股票组合的方差,计算公式是