数据样本:
股票代码_Stkcd | 日期_Date | 日收益率_Dret |
| 000001 | 2003-01-02 | -0.0439 |
| 000001 | 2003-01-03 | -0.001 |
| 000001 | 2003-01-06 | 0.004 |
| 000001 | 2003-01-07 | -0.002 |
| 000001 | 2003-01-08 | 0.0488 |
| 000001 | 2003-01-09 | 0.0152 |
| 000001 | 2003-01-10 | -0.015 |
| 000001 | 2003-01-13 | -0.0123 |
| 000001 | 2003-01-14 | 0.1 |
| 000007 | 2003-01-02 | -0.0127 |
| 000007 | 2003-01-03 | 0.0077 |
| 000007 | 2003-01-06 | 0.032 |
| 000007 | 2003-01-07 | -0.0062 |
| 000007 | 2003-01-08 | 0.0324 |
| 000007 | 2003-01-09 | 0.0133 |
| 000007 | 2003-01-10 | -0.0083 |
| 000007 | 2003-01-13 | 0.0036 |
| 000007 | 2003-01-14 | 0.0611 |


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