请教各位大神:如何在日度数据中分别求出每个月的标准差,比如数据如下
2005-01-31 922.65
2005-02-01 913.33
2005-02-02 964.24
2005-02-03 945.31
2005-02-04 962.03
2005-02-16 972.34
2005-02-17 977.27
2005-02-18 964.77
2005-02-21 981.82
2005-02-22 1,007.69
2005-02-23 1,019.26
2005-02-24 1,024.45
2005-02-25 1,024.12
2005-02-28 1,020.85
2005-03-01 1,021.16
2005-03-02 1,006.15
2005-03-03 1,011.29
2005-03-04 1,003.21
2005-03-07 1,006.95
2005-03-08 1,029.46
2005-03-09 1,032.55
2005-03-10 1,005.55
2005-03-11 1,009.43
2005-03-14 1,007.77
2005-03-15 993.83
2005-03-16 983.92
2005-03-17 970.97
2005-03-18 949.51
2005-03-21 949.55
2005-03-22 922.56
2005-03-23 923.19
2005-03-24 933.35
2005-03-25 931.42
2005-03-28 922.92
2005-03-29 916.81
2005-03-30 888.95
2005-03-31 896.07
2005-04-01 927.55
2005-04-04 909.87
2005-04-05 901.74
2005-04-06 918.56
2005-04-07 932.33
2005-04-08 949.46
2005-04-11 948.51
2005-04-12 927.41
2005-04-13 950.23
2005-04-14 935.43
2005-04-15 913.27
2005-04-18 901.12
2005-04-19 902.79
2005-04-20 884.08
2005-04-21 867.33
2005-04-22 857.40
2005-04-25 841.06
2005-04-26 855.24
2005-04-27 839.95
2005-04-28 860.62
2005-04-29 847.61
2005-05-09 818.40
2005-05-10 818.09
2005-05-11 811.57
2005-05-12 807.51
2005-05-13 814.88
2005-05-16 808.17
2005-05-17 818.46
2005-05-18 824.64
2005-05-19 824.94
2005-05-20 819.13
2005-05-23 793.72
2005-05-24 808.74
2005-05-25 809.70
2005-05-26 799.02
2005-05-27 791.00
2005-05-30 797.53
2005-05-31 796.87
2005-06-01 778.67
2005-06-02 769.42
2005-06-03 765.97
2005-06-06 778.21
2005-06-07 779.84
2005-06-08 841.36
2005-06-09 849.73
2005-06-10 831.61
2005-06-13 834.25
2005-06-14 818.19
2005-06-15 796.26
2005-06-16 803.95
2005-06-17 800.14
2005-06-20 823.73
2005-06-21 816.20
2005-06-22 818.65
2005-06-23 809.35
2005-06-24 813.20
2005-06-27 834.35
2005-06-28 819.05
2005-06-29 814.06
2005-06-30 791.50
2005-07-01 760.35
2005-07-04 749.48
2005-07-05 744.60
2005-07-06 743.44
2005-07-07 747.42
2005-07-08 722.85
2005-07-11 714.48
2005-07-12 739.53
2005-07-13 732.44
2005-07-14 732.54
2005-07-15 714.49
2005-07-18 696.85
2005-07-19 703.07
2005-07-20 707.29
2005-07-21 704.79
2005-07-22 721.45
2005-07-25 718.87
2005-07-26 735.86
2005-07-27 750.02
2005-07-28 747.23
2005-07-29 744.83
2005-08-01 750.49
2005-08-02 763.29
2005-08-03 769.75
2005-08-04 765.26
2005-08-05 787.82
2005-08-08 800.12
2005-08-09 814.19
2005-08-10 823.84
2005-08-11 832.84
2005-08-12 816.39
2005-08-15 839.67
2005-08-16 839.26
2005-08-17 854.53
2005-08-18 820.66
2005-08-19 820.87
2005-08-22 831.50
2005-08-23 816.91
2005-08-24 826.72
2005-08-25 836.42
2005-08-26 840.43
2005-08-29 832.25
2005-08-30 827.55
2005-08-31 845.14
2005-09-01 865.41
2005-09-02 872.49
2005-09-05 884.29
2005-09-06 862.49
2005-09-07 888.13
2005-09-08 889.69
2005-09-09 879.50
2005-09-12 883.56
2005-09-13 904.31
2005-09-14 914.98
2005-09-15 918.51
2005-09-16 917.64
2005-09-19 930.49
2005-09-20 924.16
2005-09-21 909.79
2005-09-22 880.01
2005-09-23 868.55
2005-09-26 874.84
2005-09-27 856.96
2005-09-28 852.36
2005-09-29 871.29
2005-09-30 869.51
2005-10-10 858.75
2005-10-11 878.62
2005-10-12 887.71
2005-10-13 883.45
2005-10-14 876.05
2005-10-17 878.76
2005-10-18 893.70
2005-10-19 886.31
2005-10-20 886.55
2005-10-21 895.03
2005-10-24 897.76
2005-10-25 877.58
2005-10-26 854.03
2005-10-27 847.59
2005-10-28 825.06
2005-10-31 828.66
2005-11-01 823.33
2005-11-02 840.32
2005-11-03 828.91
2005-11-04 835.12
2005-11-07 842.00
2005-11-08 848.97
2005-11-09 845.11
2005-11-10 821.27
2005-11-11 823.96
2005-11-14 827.57
2005-11-15 820.49
2005-11-16 826.69
2005-11-17 825.80
2005-11-18 843.74
2005-11-21 846.96
2005-11-22 831.77
2005-11-23 838.12
2005-11-24 841.70
2005-11-25 841.13
2005-11-28 838.34
2005-11-29 827.01
2005-11-30 829.50
2005-12-01 828.19
2005-12-02 817.86
2005-12-05 796.93
2005-12-06 798.88
2005-12-07 806.78
2005-12-08 805.56
2005-12-09 819.20
2005-12-12 824.52
2005-12-13 824.86
2005-12-14 832.51
2005-12-15 827.54
2005-12-16 834.54
2005-12-19 834.71
2005-12-20 836.12
2005-12-21 830.77
2005-12-22 835.50
2005-12-23 845.59
2005-12-26 853.17
2005-12-27 854.53
2005-12-28 857.21
2005-12-29 866.75
2005-12-30 860.13
如何在这些数据中分别求出每个月的标准差?谢谢!


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