Question: 通威股份的下行偏差，在2024年11月08日-2025年09月27日期间为多少？（默认目标收益率为0；无需年化）使用不复权价格，写出指标公式，搜集原始数据，计算得出答案，保留四位小数。注意列出原始数据和关键计算过程。
Formula: DD = \sqrt{1 / N * \sum_{t=1}^{N} min(r_t - rf, 0)^2}
Data:
date,close
2024-11-07,29.5
2024-11-08,30.09
2024-11-11,30.23
2024-11-12,29.63
2024-11-13,29.8
2024-11-14,28.9
2024-11-15,26.55
2024-11-18,26.74
2024-11-19,27.41
2024-11-20,27.0
2024-11-21,27.15
2024-11-22,25.99
2024-11-25,25.99
2024-11-26,26.31
2024-11-27,27.01
2024-11-28,27.02
2024-11-29,27.45
2024-12-02,27.54
2024-12-03,28.0
2024-12-04,26.86
2024-12-05,27.17
2024-12-06,26.01
2024-12-09,25.74
2024-12-10,25.26
2024-12-11,25.26
2024-12-12,25.25
2024-12-13,24.07
2024-12-16,23.59
2024-12-17,23.5
2024-12-18,23.47
2024-12-19,23.13
2024-12-20,22.66
2024-12-23,22.91
2024-12-24,23.86
2024-12-25,23.74
2024-12-26,22.39
2024-12-27,22.05
2024-12-30,22.6
2024-12-31,22.11
2025-01-02,22.09
2025-01-03,21.29
2025-01-06,21.14
2025-01-07,21.12
2025-01-08,21.15
2025-01-09,20.9
2025-01-10,20.05
2025-01-13,20.18
2025-01-14,20.71
2025-01-15,21.54
2025-01-16,21.72
2025-01-17,21.72
2025-01-20,21.17
2025-01-21,20.19
2025-01-22,19.98
2025-01-23,19.8
2025-01-24,20.71
2025-01-27,20.46
2025-02-05,20.58
2025-02-06,21.08
2025-02-07,22.74
2025-02-10,22.12
2025-02-11,21.39
2025-02-12,21.77
2025-02-13,21.43
2025-02-14,21.47
2025-02-17,21.78
2025-02-18,20.9
2025-02-19,21.19
2025-02-20,20.49
2025-02-21,20.58
2025-02-24,20.8
2025-02-25,21.42
2025-02-26,22.07
2025-02-27,21.56
2025-02-28,21.09
2025-03-03,21.31
2025-03-04,21.28
2025-03-05,20.64
2025-03-06,21.33
2025-03-07,21.42
2025-03-10,21.77
2025-03-11,22.07
2025-03-12,21.45
2025-03-13,21.02
2025-03-14,21.63
2025-03-17,21.66
2025-03-18,21.49
2025-03-19,21.12
2025-03-20,21.0
2025-03-21,20.79
2025-03-24,20.51
2025-03-25,20.5
2025-03-26,20.81
2025-03-27,20.32
2025-03-28,19.98
2025-03-31,19.13
2025-04-01,19.18
2025-04-02,18.89
2025-04-03,18.62
2025-04-07,16.76
2025-04-08,17.01
2025-04-09,17.2
2025-04-10,17.47
2025-04-11,17.31
2025-04-14,17.4
2025-04-15,17.25
2025-04-16,17.45
2025-04-17,17.27
2025-04-18,16.93
2025-04-21,17.01
2025-04-22,16.91
2025-04-23,17.01
2025-04-24,16.8
2025-04-25,16.66
2025-04-28,16.6
2025-04-29,16.31
2025-04-30,16.31
2025-05-06,16.63
2025-05-07,16.7
2025-05-08,16.9
2025-05-09,16.5
2025-05-12,17.06
2025-05-13,18.35
2025-05-14,17.79
2025-05-15,17.2
2025-05-16,17.22
2025-05-19,16.98
2025-05-20,17.15
2025-05-21,17.18
2025-05-22,16.99
2025-05-23,16.84
2025-05-26,17.13
2025-05-27,16.95
2025-05-28,16.88
2025-05-29,17.0
2025-05-30,16.29
2025-06-03,16.19
2025-06-04,16.31
2025-06-05,16.23
2025-06-06,16.09
2025-06-09,16.27
2025-06-10,15.96
2025-06-11,16.14
2025-06-12,16.0
2025-06-13,15.93
2025-06-16,15.66
2025-06-17,15.59
2025-06-18,15.39
2025-06-19,14.98
2025-06-20,15.23
2025-06-23,15.06
2025-06-24,15.48
2025-06-25,15.67
2025-06-26,15.67
2025-06-27,15.65
2025-06-30,16.75
2025-07-01,16.18
2025-07-02,17.8
2025-07-03,18.32
2025-07-04,18.36
2025-07-07,18.2
2025-07-08,20.02
2025-07-09,20.27
2025-07-10,20.81
2025-07-11,20.39
2025-07-14,20.63
2025-07-15,20.16
2025-07-16,20.63
2025-07-17,20.79
2025-07-18,20.36
2025-07-21,20.53
2025-07-22,21.67
2025-07-23,21.18
2025-07-24,21.87
2025-07-25,21.13
2025-07-28,20.6
2025-07-29,21.31
2025-07-30,21.85
2025-07-31,20.43
2025-08-01,20.58
2025-08-04,20.07
2025-08-05,20.55
2025-08-06,20.42
2025-08-07,20.14
2025-08-08,20.15
2025-08-11,20.88
2025-08-12,20.36
2025-08-13,20.18
2025-08-14,19.56
2025-08-15,20.81
2025-08-18,20.79
2025-08-19,20.61
2025-08-20,20.77
2025-08-21,20.66
2025-08-22,21.03
2025-08-25,21.57
2025-08-26,21.32
2025-08-27,20.9
2025-08-28,21.53
2025-08-29,22.03
2025-09-01,22.58
2025-09-02,21.9
2025-09-03,21.98
2025-09-04,22.97
2025-09-05,24.39
2025-09-08,24.08
2025-09-09,23.68
2025-09-10,22.26
2025-09-11,22.44
2025-09-12,22.23
2025-09-15,22.16
2025-09-16,22.39
2025-09-17,22.99
2025-09-18,22.1
2025-09-19,21.83
2025-09-22,21.28
2025-09-23,20.77
2025-09-24,21.74
2025-09-25,21.97
2025-09-26,21.74

Indicator data:
Answer: 0.0188