[英]How to find the monthly return of stocks using data.table in R?
我有兩個股票的兩個月數據如下 -
dt <- structure(list(date = structure(c(18718, 18722, 18723, 18724,
18725, 18726, 18729, 18730, 18731, 18732, 18733, 18736, 18737,
18738, 18739, 18740, 18743, 18744, 18745, 18746, 18747, 18750,
18751, 18752, 18753, 18754, 18757, 18758, 18759, 18760, 18761,
18764, 18765, 18766, 18767, 18768, 18771, 18772, 18773, 18774,
18778, 18718, 18722, 18723, 18724, 18725, 18726, 18729, 18730,
18731, 18732, 18733, 18736, 18737, 18738, 18739, 18740, 18743,
18744, 18745, 18746, 18747, 18750, 18751, 18752, 18753, 18754,
18757, 18758, 18759, 18760, 18761, 18764, 18765, 18766, 18767,
18768, 18771, 18772, 18773, 18774, 18778), class = "Date"),
close = c(123,
125.9, 126.21, 127.9, 130.36, 132.995, 131.24, 134.43, 132.03,
134.5, 134.16, 134.84, 133.11, 133.5, 131.94, 134.32, 134.72,
134.39, 133.58, 133.48, 131.46, 132.54, 127.85, 128.1, 129.74,
130.21, 126.85, 125.91, 122.77, 124.97, 127.45, 126.27, 124.85,
124.69, 127.31, 125.43, 127.1, 126.9, 126.85, 125.28, 124.61,
2137.75, 2225.55, 2224.75, 2249.68, 2265.44, 2285.88, 2254.79,
2267.27, 2254.84, 2296.66, 2297.76, 2302.4, 2293.63, 2293.29,
2267.92, 2315.3, 2326.74, 2307.12, 2379.91, 2429.89, 2410.12,
2395.17, 2354.25, 2356.74, 2381.35, 2398.69, 2341.66, 2308.76,
2239.08, 2261.97, 2316.16, 2321.41, 2303.43, 2308.71, 2356.09,
2345.1, 2406.67, 2409.07, 2433.53, 2402.51, 2411.56),
ticker = c("AAPL",
"AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL",
"AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL",
"AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL",
"AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL",
"AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL", "AAPL",
"GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG",
"GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG",
"GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG",
"GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG",
"GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG", "GOOG",
"GOOG")), row.names = c(NA, -82L), class = c("data.table", "data.frame"
))
我想僅使用 data.table 找到這些股票的月收益。 是否有任何現有的 function 或實現此目的的簡單方法？
我嘗試使用以下代碼解決它，但它給出了錯誤 -
dt[, return := rep(periodReturn(.SD, period = 'monthly', type = "arithmetic"), .N), by = .(ticker)]
這是錯誤
Error in `[.data.table`(dt, , `:=`(return, rep(periodReturn(.SD, period = "monthly", :
Supplied 82 items to be assigned to group 1 of size 41 in column 'return'. The RHS length must either be 1 (single values are ok) or match the LHS length exactly. If you wish to 'recycle' the RHS please use rep() explicitly to make this intent clear to readers of your code.
任何見解都會有所幫助。
預期的 output 是
ticker month return
AAPL 4 0.06878049
AAPL 5 -0.05210710
GOOG 4 0.1274096597
GOOG 5 0.0005974806
如果我們在rep中指定length.out ，也許可以解決大小不匹配的錯誤
library(data.table)
library(quantmod)
dt[, return := rep(periodReturn(.SD, period = 'monthly',
type = "arithmetic"), length.out = .N), by = .(ticker)]
-輸出
dt
date close ticker return
1: 2021-04-01 123.000 AAPL 0.0687804878
2: 2021-04-05 125.900 AAPL -0.0521071048
3: 2021-04-06 126.210 AAPL 0.0687804878
4: 2021-04-07 127.900 AAPL -0.0521071048
5: 2021-04-08 130.360 AAPL 0.0687804878
6: 2021-04-09 132.995 AAPL -0.0521071048
7: 2021-04-12 131.240 AAPL 0.0687804878
8: 2021-04-13 134.430 AAPL -0.0521071048
9: 2021-04-14 132.030 AAPL 0.0687804878
10: 2021-04-15 134.500 AAPL -0.0521071048
11: 2021-04-16 134.160 AAPL 0.0687804878
12: 2021-04-19 134.840 AAPL -0.0521071048
13: 2021-04-20 133.110 AAPL 0.0687804878
14: 2021-04-21 133.500 AAPL -0.0521071048
15: 2021-04-22 131.940 AAPL 0.0687804878
16: 2021-04-23 134.320 AAPL -0.0521071048
17: 2021-04-26 134.720 AAPL 0.0687804878
18: 2021-04-27 134.390 AAPL -0.0521071048
19: 2021-04-28 133.580 AAPL 0.0687804878
20: 2021-04-29 133.480 AAPL -0.0521071048
21: 2021-04-30 131.460 AAPL 0.0687804878
22: 2021-05-03 132.540 AAPL -0.0521071048
23: 2021-05-04 127.850 AAPL 0.0687804878
24: 2021-05-05 128.100 AAPL -0.0521071048
25: 2021-05-06 129.740 AAPL 0.0687804878
26: 2021-05-07 130.210 AAPL -0.0521071048
27: 2021-05-10 126.850 AAPL 0.0687804878
28: 2021-05-11 125.910 AAPL -0.0521071048
29: 2021-05-12 122.770 AAPL 0.0687804878
30: 2021-05-13 124.970 AAPL -0.0521071048
31: 2021-05-14 127.450 AAPL 0.0687804878
32: 2021-05-17 126.270 AAPL -0.0521071048
33: 2021-05-18 124.850 AAPL 0.0687804878
34: 2021-05-19 124.690 AAPL -0.0521071048
35: 2021-05-20 127.310 AAPL 0.0687804878
36: 2021-05-21 125.430 AAPL -0.0521071048
37: 2021-05-24 127.100 AAPL 0.0687804878
38: 2021-05-25 126.900 AAPL -0.0521071048
39: 2021-05-26 126.850 AAPL 0.0687804878
40: 2021-05-27 125.280 AAPL -0.0521071048
41: 2021-05-31 124.610 AAPL 0.0687804878
42: 2021-04-01 2137.750 GOOG 0.1274096597
43: 2021-04-05 2225.550 GOOG 0.0005974806
44: 2021-04-06 2224.750 GOOG 0.1274096597
45: 2021-04-07 2249.680 GOOG 0.0005974806
46: 2021-04-08 2265.440 GOOG 0.1274096597
47: 2021-04-09 2285.880 GOOG 0.0005974806
48: 2021-04-12 2254.790 GOOG 0.1274096597
49: 2021-04-13 2267.270 GOOG 0.0005974806
50: 2021-04-14 2254.840 GOOG 0.1274096597
51: 2021-04-15 2296.660 GOOG 0.0005974806
52: 2021-04-16 2297.760 GOOG 0.1274096597
53: 2021-04-19 2302.400 GOOG 0.0005974806
54: 2021-04-20 2293.630 GOOG 0.1274096597
55: 2021-04-21 2293.290 GOOG 0.0005974806
56: 2021-04-22 2267.920 GOOG 0.1274096597
57: 2021-04-23 2315.300 GOOG 0.0005974806
58: 2021-04-26 2326.740 GOOG 0.1274096597
59: 2021-04-27 2307.120 GOOG 0.0005974806
60: 2021-04-28 2379.910 GOOG 0.1274096597
61: 2021-04-29 2429.890 GOOG 0.0005974806
62: 2021-04-30 2410.120 GOOG 0.1274096597
63: 2021-05-03 2395.170 GOOG 0.0005974806
64: 2021-05-04 2354.250 GOOG 0.1274096597
65: 2021-05-05 2356.740 GOOG 0.0005974806
66: 2021-05-06 2381.350 GOOG 0.1274096597
67: 2021-05-07 2398.690 GOOG 0.0005974806
68: 2021-05-10 2341.660 GOOG 0.1274096597
69: 2021-05-11 2308.760 GOOG 0.0005974806
70: 2021-05-12 2239.080 GOOG 0.1274096597
71: 2021-05-13 2261.970 GOOG 0.0005974806
72: 2021-05-14 2316.160 GOOG 0.1274096597
73: 2021-05-17 2321.410 GOOG 0.0005974806
74: 2021-05-18 2303.430 GOOG 0.1274096597
75: 2021-05-19 2308.710 GOOG 0.0005974806
76: 2021-05-20 2356.090 GOOG 0.1274096597
77: 2021-05-21 2345.100 GOOG 0.0005974806
78: 2021-05-24 2406.670 GOOG 0.1274096597
79: 2021-05-25 2409.070 GOOG 0.0005974806
80: 2021-05-26 2433.530 GOOG 0.1274096597
81: 2021-05-27 2402.510 GOOG 0.0005974806
82: 2021-05-31 2411.560 GOOG 0.1274096597
如果我們想總結一下，將它包裝在一個list ，因為在periodReturn的matrix之上構建的xts屬性可能需要它被阻止在一個list 。 當我們使用rep時，它會xts/matrix屬性，結果列是numeric vector
dt[, .(return = .(periodReturn(.SD, period = 'monthly',
type = "arithmetic"))), .(ticker)]
ticker return
1: AAPL 0.06878049,-0.05210710
2: GOOG 0.1274096597,0.0005974806
或者通過轉換為numeric來刪除xts屬性，它應該可以工作
library(lubridate)
dt[, .(month = unique(month(date)),
return = as.numeric(periodReturn(.SD, period = 'monthly',
type = "arithmetic"))), .(ticker)]
ticker month return
1: AAPL 4 0.0687804878
2: AAPL 5 -0.0521071048
3: GOOG 4 0.1274096597
4: GOOG 5 0.0005974806
計算 data.table 每個月不同數量股票的平均月收益
[英]Calculate average monthly returns in data.table with differing number of stocks in each month
使用data.table匯總每月序列（計算特定事件）
[英]Using data.table to summarize monthly sequences (count specific events)
如何使用R包data.table和滾動連接查找最后一個或下一個條目
[英]How to find the last or next entry using R package data.table and rolling joins
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