【发布时间】：2017-04-12 04:08:33
【问题描述】：
我正在尝试根据其在整个日期范围内的回报数据计算证券 S 和证券 B 每分钟回报的标准偏差。
下面是sample，用于证券 S 在样本中所有日期的 15:41 时间的回报。
c(9.78237288670086e-05, -0.000478679433439075, -0.000815849476806222,
-0.00104531810077364, 0.000991518042062172, -0.000481762633530326,
0.000103264062935107, 0.000533498558109242, 0.00013655059028412,
0.000684017572494667, -0.0010666543999283, 0.00111305447657944,
0.000350943499215542, -0.000728452559245173, -0.000133010630777755,
0.000273805385288854, -0.000541815253997811)
我应该得到标准差：
sd(sample)
[1] 0.0006778196
同样为 12:02，另一个假 NA：
c(6.60974283750572e-05, 0.000136481483259815, -6.6884541045211e-05,
3.45265989371524e-07, 0.000262426448938174, 6.59361301702748e-05,
0.000129839556949415, 0.000548861044701233, 0.000131773159828252,
-0.000336677148988292)
我应该得到
sd(sample)
[1] 0.0002264425
对于12:04，类似的NA现象：
c(-0.000511510506030053, -6.36748185365645e-05, -0.000461914296267199,
0.000498827890900754, -0.000407637171003328, -0.000344290866374583,
-0.000170414237452937, 0.00012470163477781, -0.00025976973379323,
-6.84333430222517e-05, 6.74028653020233e-05, 0.000349203389118181,
1.73806217228455e-07)
现实中
sd(sample)
[1] 0.0003077007
dput for 12:04：如果为此运行 dplyr 命令，它应该返回完全有效的标准偏差
structure(list(DATETIME = structure(1:13, .Label = c("2007-06-06 12:04:00",
"2007-06-27 12:04:00", "2007-07-25 12:04:00", "2007-08-03 12:04:00",
"2007-08-27 12:04:00", "2007-08-29 12:04:00", "2007-09-11 12:04:00",
"2007-09-26 12:04:00", "2007-10-29 12:04:00", "2007-11-13 12:04:00",
"2007-11-14 12:04:00", "2007-11-26 12:04:00", "2007-12-13 12:04:00"
), class = "factor"), MINUTE = c(4L, 4L, 4L, 4L, 4L, 4L, 4L,
4L, 4L, 4L, 4L, 4L, 4L), HOUR = c(12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L), DAY = c(6L, 27L, 25L, 3L,
27L, 29L, 11L, 26L, 29L, 13L, 14L, 26L, 13L), MONTH = c(6L, 6L,
7L, 8L, 8L, 8L, 9L, 9L, 10L, 11L, 11L, 11L, 12L), YEAR = c(2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L), RET.B = c(0, -2.17485863410644e-06, 0,
0, 0, 0.000430714747194296, 0.000652460524786482, -0.000224157179885068,
0, 0.000431560597189706, 0, -0.000522420548541596, 0), RET.S = c(-0.000511510506030053,
-6.36748185365645e-05, -0.000461914296267199, 0.000498827890900754,
-0.000407637171003328, -0.000344290866374583, -0.000170414237452937,
0.00012470163477781, -0.00025976973379323, -6.84333430222517e-05,
6.74028653020233e-05, 0.000349203389118181, 1.73806217228455e-07
)), class = "data.frame", row.names = c(NA, -13L), .Names = c("DATETIME",
"MINUTE", "HOUR", "DAY", "MONTH", "YEAR", "RET.B", "RET.S"))
但是，由于我的大样本包含更多的分钟和天数，我通过以下 dplyr 命令计算了它们的标准偏差
data_original %>%
group_by(HOUR, MINUTE) %>%
summarise(STD_DEV_S = sd(RET.S),
STD_DEV_B = sd(RET.B))
注意：我也尝试了 Na.rm = TRUE 参数，没有改变。未删除任何 NA
data_original <- data_original %>%
group_by(HOUR, MINUTE) %>%
summarise(STD_DEV_S = sd(RET.S, na.rm = TRUE),
STD_DEV_BIL = sd(RET.B, na.rm = TRUE))
下面是标准差数据集的dput：
structure(list(HOUR = c(12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 13L, 13L, 13L, 13L, 13L,
13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L,
13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L,
14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L,
14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 15L,
15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L,
15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L),
MINUTE = c(2L, 4L, 8L, 14L, 22L, 29L, 44L, 46L, 47L, 48L,
49L, 51L, 52L, 54L, 56L, 58L, 0L, 5L, 9L, 16L, 18L, 19L,
21L, 25L, 28L, 30L, 32L, 33L, 34L, 35L, 36L, 37L, 38L, 41L,
42L, 43L, 44L, 45L, 46L, 47L, 48L, 49L, 50L, 51L, 57L, 58L,
59L, 3L, 4L, 6L, 7L, 8L, 13L, 14L, 15L, 16L, 19L, 24L, 27L,
28L, 29L, 30L, 37L, 41L, 43L, 51L, 53L, 54L, 55L, 56L, 57L,
59L, 1L, 2L, 3L, 10L, 12L, 14L, 15L, 29L, 33L, 34L, 35L,
37L, 39L, 41L, 42L, 44L, 45L, 47L, 48L, 50L, 52L, 53L, 55L,
56L, 57L, 59L), STD_DEV_S = c(NA, NA, NA, NA, NA, NA, NA,
1.00694568830708e-10, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, 0.000193132875381868, NA, NA, NA, NA, 0.000238078900543023,
NA, NA, NA, 9.53251626570527e-05, 9.12458748630885e-05, 3.68329210829957e-05,
NA, 8.26407656897388e-05, NA, NA, 0.000292533661987067, NA,
NA, 0.000302477582215417, NA, 0.00014151757269228, NA, 1.47800176921126e-06,
NA, 0.000177633950322518, NA, NA, 0.000246543106829263, NA,
NA, NA, 0.000882128914387174, NA, 0.0111616060713996, NA,
NA, NA, NA, NA, NA, NA, NA, 0.000333828124024393, NA, 6.17648758558693e-05,
NA, 0.000175379264691811, NA, 0.00172685329635406, NA, NA,
0.00173851454042975, NA, NA, NA, NA, NA, 0.000713775044911004,
0.000608137130111404, 0.000148678119710893, NA, NA, NA, NA,
NA, 0.000340832680361768, NA, 7.60599434434376e-06, NA, NA,
NA, 0.00015470058433227, 0.000870316976462816, 0.000280759320556483,
NA, NA, 0.000303553445174538), STD_DEV_B = c(NA, NA, NA,
NA, NA, NA, NA, 0.000152478664167725, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, 1.53786063292825e-06, NA, NA,
NA, NA, 0.000310723454012154, NA, NA, NA, 0.000155594306042618,
0.000154289064190793, 0.000251349703608842, NA, 0.000925936422330737,
NA, NA, 0.000424250083757898, NA, NA, 0.000324016266256633,
NA, 0.000924893664437753, NA, 1.54020544841043e-06, NA, 0.000154255406018086,
NA, NA, 0.000347279332142245, NA, NA, NA, 7.44041572526506e-05,
NA, 0.000685450210200628, NA, NA, NA, NA, NA, NA, NA, NA,
0.000617156256763284, NA, 1.10975260021509e-06, NA, 0.000108866030344832,
NA, 0.000227892543844934, NA, NA, 0.000616618078209316, NA,
NA, NA, NA, NA, 0.000771310776315698, 0.000240271526606721,
0.000154120920049348, NA, NA, NA, NA, NA, 0, NA, 0, NA, NA,
NA, 1.54087335195036e-06, 0.000129386204897517, 0.000227858493926251,
NA, NA, 0.0002286421278086), TIME = structure(c(0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), year = c(0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0), month = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0), day = c(0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), hour = c(12, 12,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15), minute = c(2, 4, 8, 14, 22, 29,
44, 46, 47, 48, 49, 51, 52, 54, 56, 58, 0, 5, 9, 16, 18,
19, 21, 25, 28, 30, 32, 33, 34, 35, 36, 37, 38, 41, 42, 43,
44, 45, 46, 47, 48, 49, 50, 51, 57, 58, 59, 3, 4, 6, 7, 8,
13, 14, 15, 16, 19, 24, 27, 28, 29, 30, 37, 41, 43, 51, 53,
54, 55, 56, 57, 59, 1, 2, 3, 10, 12, 14, 15, 29, 33, 34,
35, 37, 39, 41, 42, 44, 45, 47, 48, 50, 52, 53, 55, 56, 57,
59), class = structure("Period", package = "lubridate"))), class = "data.frame", row.names = c(NA,
-98L), .Names = c("HOUR", "MINUTE", "STD_DEV_S", "STD_DEV_B",
"TIME"))
如您所见，在 15:41，S 的标准差返回为 NA，前 7 个 NA 值相同：02、12:04、12:08、12:14、12 :22, 12:29, 12:44
前 7 个 NA 值中还有 dput：如果您运行 dplyr 命令，它应该返回完全有效的标准偏差
structure(list(DATETIME = structure(1:83, .Label = c("2007-06-06 12:04:00",
"2007-06-12 12:14:00", "2007-06-27 12:04:00", "2007-07-12 12:29:00",
"2007-07-13 12:29:00", "2007-07-20 12:22:00", "2007-07-20 12:29:00",
"2007-07-25 12:02:00", "2007-07-25 12:04:00", "2007-07-30 12:08:00",
"2007-07-31 12:08:00", "2007-08-03 12:02:00", "2007-08-03 12:04:00",
"2007-08-03 12:08:00", "2007-08-03 12:14:00", "2007-08-06 12:08:00",
"2007-08-08 12:02:00", "2007-08-09 12:14:00", "2007-08-13 12:08:00",
"2007-08-13 12:14:00", "2007-08-14 12:29:00", "2007-08-14 12:44:00",
"2007-08-16 12:08:00", "2007-08-23 12:29:00", "2007-08-27 12:04:00",
"2007-08-28 12:29:00", "2007-08-29 12:04:00", "2007-08-30 12:22:00",
"2007-08-30 12:44:00", "2007-08-31 12:08:00", "2007-08-31 12:29:00",
"2007-09-05 12:08:00", "2007-09-05 12:14:00", "2007-09-05 12:22:00",
"2007-09-07 12:08:00", "2007-09-11 12:02:00", "2007-09-11 12:04:00",
"2007-09-13 12:22:00", "2007-09-13 12:29:00", "2007-09-14 12:29:00",
"2007-09-18 12:08:00", "2007-09-18 12:29:00", "2007-09-24 12:14:00",
"2007-09-24 12:29:00", "2007-09-25 12:44:00", "2007-09-26 12:04:00",
"2007-09-28 12:02:00", "2007-09-28 12:08:00", "2007-10-05 12:08:00",
"2007-10-09 12:22:00", "2007-10-11 12:44:00", "2007-10-12 12:14:00",
"2007-10-15 12:08:00", "2007-10-17 12:29:00", "2007-10-19 12:02:00",
"2007-10-29 12:04:00", "2007-10-30 12:14:00", "2007-10-30 12:44:00",
"2007-10-31 12:02:00", "2007-11-07 12:08:00", "2007-11-07 12:14:00",
"2007-11-13 12:04:00", "2007-11-14 12:04:00", "2007-11-14 12:22:00",
"2007-11-19 12:22:00", "2007-11-20 12:08:00", "2007-11-20 12:44:00",
"2007-11-21 12:14:00", "2007-11-21 12:22:00", "2007-11-26 12:04:00",
"2007-11-28 12:02:00", "2007-11-28 12:22:00", "2007-11-29 12:22:00",
"2007-11-30 12:14:00", "2007-12-06 12:08:00", "2007-12-10 12:02:00",
"2007-12-10 12:08:00", "2007-12-11 12:22:00", "2007-12-13 12:04:00",
"2007-12-17 12:08:00", "2007-12-18 12:14:00", "2007-12-26 12:22:00",
"2007-12-27 12:02:00"), class = "factor"), MINUTE = c(4L, 14L,
4L, 29L, 29L, 22L, 29L, 2L, 4L, 8L, 8L, 2L, 4L, 8L, 14L, 8L,
2L, 14L, 8L, 14L, 29L, 44L, 8L, 29L, 4L, 29L, 4L, 22L, 44L, 8L,
29L, 8L, 14L, 22L, 8L, 2L, 4L, 22L, 29L, 29L, 8L, 29L, 14L, 29L,
44L, 4L, 2L, 8L, 8L, 22L, 44L, 14L, 8L, 29L, 2L, 4L, 14L, 44L,
2L, 8L, 14L, 4L, 4L, 22L, 22L, 8L, 44L, 14L, 22L, 4L, 2L, 22L,
22L, 14L, 8L, 2L, 8L, 22L, 4L, 8L, 14L, 22L, 2L), HOUR = c(12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L,
12L, 12L, 12L, 12L), DAY = c(6L, 12L, 27L, 12L, 13L, 20L, 20L,
25L, 25L, 30L, 31L, 3L, 3L, 3L, 3L, 6L, 8L, 9L, 13L, 13L, 14L,
14L, 16L, 23L, 27L, 28L, 29L, 30L, 30L, 31L, 31L, 5L, 5L, 5L,
7L, 11L, 11L, 13L, 13L, 14L, 18L, 18L, 24L, 24L, 25L, 26L, 28L,
28L, 5L, 9L, 11L, 12L, 15L, 17L, 19L, 29L, 30L, 30L, 31L, 7L,
7L, 13L, 14L, 14L, 19L, 20L, 20L, 21L, 21L, 26L, 28L, 28L, 29L,
30L, 6L, 10L, 10L, 11L, 13L, 17L, 18L, 26L, 27L), MONTH = c(6L,
6L, 6L, 7L, 7L, 7L, 7L, 7L, 7L, 7L, 7L, 8L, 8L, 8L, 8L, 8L, 8L,
8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 9L, 9L,
9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 10L,
10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 11L, 11L, 11L,
11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L), YEAR = c(2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L,
2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L, 2007L
), RET.B = c(0, 0, -2.17485863410644e-06, -0.000218102508178801,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.000436681222707492, 2.18198163199602e-06,
0, 0.000435872294594679, -0.000302850759441319, 0, 0, 0.000217533173808963,
0.00043506634761808, 0, 0, 0.000430714747194296, 0.000217344055640189,
-0.000434593654932706, -0.000165261940175256, -0.00021625478379565,
0, 0, -0.000436300174520138, 0.00052142420804618, -0.000654164849542109,
0.000652460524786482, -2.17959895386486e-06, 2.17960370452681e-06,
0, 0, -0.000749446149323345, 0, 0, 0, -0.000224157179885068,
-0.00108832889442356, 0, -0.000654450261780129, 0, 2.18055425319755e-06,
0.000122125684776186, 0, 0, -0.000871032643209069, 0, 0, -0.00012189812799306,
-0.000653073037201933, -0.000322828325131771, 0, 0.000431560597189706,
0, -0.000436109899694636, 0, -0.000653452406882902, 0, -0.00043529919659603,
0, -0.000522420548541596, 0.000871080139372804, 0, 0, -0.00050891692040007,
0, 5.66975013847502e-05, -6.10553859572739e-05, 0.000881139961039179,
0, 0.00108984711796917, 0.000436014824504101, -0.000217722621380318,
-0.000169786678275926), RET.S = c(-0.000511510506030053, 1.50798142768921e-07,
-6.36748185365645e-05, 0.000325971641531768, 7.85447691849372e-08,
0.00026122942181018, 0.000262895511244587, 6.60974283750572e-05,
-0.000461914296267199, -0.000342324311186784, 0.000337606595481509,
0.000136481483259815, 0.000498827890900754, 0.000989293539454498,
0.000346599311788321, 0.000972662223917925, -6.6884541045211e-05,
0.000880016198865045, 0.000137655341835112, -0.000204591530646723,
0.000624446736636471, 0.000486106996184283, -0.00151417908785445,
0.000342468047420744, -0.000407637171003328, 0.000137868635859495,
-0.000344290866374583, 0.00205224248761815, 0.000136403986823039,
-0.000541716313992435, 0.000135301702489429, 6.79286451856945e-05,
0.000347546504406297, -0.000203091423563585, 0.00013714072091746,
3.45265989371524e-07, -0.000170414237452937, 0.0002013455858478,
-6.70192974376605e-05, 2.71444000775529e-08, 6.70935200322906e-05,
0.000201204290073773, 0.000131185179643344, 0.000459150003030885,
0.00019864260854958, 0.00012470163477781, 0.000262426448938174,
0.000203931745297139, 0.000135250743026116, 0.000128641053195872,
-0.000189957905754624, 0.000320705988239717, 0.00012917558184182,
-0.000389339259032602, 6.59361301702748e-05, -0.00025976973379323,
0.000587406401071317, -5.08900143169655e-05, 0.000129839556949415,
-0.000199444260467586, -0.000399388070952602, -6.84333430222517e-05,
6.74028653020233e-05, 0.000591590208533922, 0.000138780968301319,
0.00020831228937301, -0.00104333906891781, 0.000844275593893371,
-0.000266904506005042, 0.000349203389118181, 0.000548861044701233,
-0.000205223882777962, -0.000135251988252783, -0.000269565436487676,
-0.000400512638518217, 0.000131773159828252, 6.59282282715629e-05,
0.000131838729908868, 1.73806217228455e-07, 0.000205075655030559,
-0.00131395883722512, 0.000268767524013111, -0.000336677148988292
)), class = "data.frame", row.names = c(NA, -83L), .Names = c("DATETIME",
"MINUTE", "HOUR", "DAY", "MONTH", "YEAR", "RET.B", "RET.S"))
我不明白为什么当我使用样本中的所有数据时会得到 NA.. 知道为什么会这样吗？手动更新所有标准差会很痛苦……
【问题讨论】：
-
粘贴结果的
dput不是很有用；向我们展示结果，并为我们提供 [一些] 原始数据的dput，以便我们可以重现/修复结果。 -
添加了 12:04 的完整输入
-
为 12:00 到 13:00 之间的所有 NA 值添加了 dput（7 个值，有问题）
-
您应该提供一个重现
NAs 的数据集。您提供的每个示例都非常有效。 -
您提供的此输入对我（和其他人）有效。值得注意的是，一般而言，
sd()可能返回 NA（即使使用na.rm = TRUE）的一个原因是如果一个组只有一行（例如，尝试sd(5)或sd(5, na.rm = TRUE)）。
标签： r dplyr standard-deviation