这个问题的关键问题是Period如何映射到Date。根据 OP 的描述,我了解到每个时期包括实际月份的最后一天加上下个月的前三天,总共 4 天。
这可以通过一些日期算术和右连接来解决:
library(data.table)
result <-
# coerce to data.table
setDT(dailycds)[
# compute period by subtracting 3 days of date
, Period := format(as.IDate(Date, "%d-%m-%Y") - 3L, "%Y%m")][
# right join, dropping all rows from dailycds without matching period
periodicassets, on = "Period"][
# change column order to be in line with expected result df
, setcolorder(.SD, names(df))]
result
Period Date Assets CDS
1: 201506 30-06-2015 1314 194
2: 201506 01-07-2015 1314 195
3: 201506 02-07-2015 1314 198
4: 201506 03-07-2015 1314 198
5: 201606 30-06-2016 2134 165
6: 201606 01-07-2016 2134 172
7: 201606 02-07-2016 2134 213
8: 201606 03-07-2016 2134 123
请求的每个周期只有4行,结果符合预期结果df:
all.equal(df, as.data.frame(result[, lapply(.SD, forcats::fct_drop)]))
[1] TRUE
必须删除未使用的级别才能通过all.equal()的严格检查
警告
代码已经过测试,可以与提供的示例数据一起使用。如果是连续的每日数据和周期性数据,可能需要添加代码以删除不属于 4 天期间的日期。
编辑:更真实的样本数据
OP 更新了他的问题,并通过 dropbox 提供更真实的示例数据。现在,dailycds 包含每日数据(周末除外)。正如上面警告中已经提到的,这需要在相关日期过滤dailycds。
OP 不清楚如何定义月初前后要考虑的日子。在这里,我们假设 月底前 3 天和月底后 6 天指的是 日历天,而不是 工作日天。
# define day range of interest relativ to turn of the month
days_before <- 3L
days_after <- 6L
stopifnot(days_before + days_after < 28)
# read data from dropbox links, note ?dl=1
dailycds <- readRDS(url("https://www.dropbox.com/s/r7v5dq6la0mnn71/dailycds.RDS?dl=1"))
periodicassets <-
readRDS(url("https://www.dropbox.com/s/gdflcngwp8nm552/periodicassets.RDS?dl=1"))
library(data.table)
# coerce to data.table
setDT(dailycds)[
# filter calendar dates
mday(Date) <= days_after | mday(Date) > lubridate::days_in_month(Date) - days_before][
# compute period by shifting dates from next month into actual month
# coersion to IDate is required because Date is of class POSIXct
, Period := format(as.IDate(Date) - days_after, "%Y%m")][
# right join, dropping all rows from dailycds without matching period
setDT(periodicassets), on = "Period"][]
Date CDS Period BankName value
1: 2015-01-06 48.633000000000003 201412 BPCE 112189.50
2: 2015-01-05 46.670999999999999 201412 BPCE 112189.50
3: 2015-01-02 45.158000000000001 201412 BPCE 112189.50
4: 2015-01-01 47.32 201412 BPCE 112189.50
5: 2014-12-31 47.658000000000001 201412 BPCE 112189.50
6: 2014-12-30 45.843000000000004 201412 BPCE 112189.50
7: 2014-12-29 47.588999999999999 201412 BPCE 112189.50
8: 2015-02-06 47.265000000000001 201501 BPCE 103142.06
9: 2015-02-05 47.073999999999998 201501 BPCE 103142.06
10: 2015-02-04 46.634999999999998 201501 BPCE 103142.06
11: 2015-02-03 46.405000000000001 201501 BPCE 103142.06
12: 2015-02-02 47.567 201501 BPCE 103142.06
13: 2015-01-30 47.396000000000001 201501 BPCE 103142.06
14: 2015-01-29 48.448999999999998 201501 BPCE 103142.06
15: 2015-01-06 48.633000000000003 201412 Credit Agricole 81618.76
16: 2015-01-05 46.670999999999999 201412 Credit Agricole 81618.76
...
26: 2015-02-02 47.567 201501 Credit Agricole 73987.36
27: 2015-01-30 47.396000000000001 201501 Credit Agricole 73987.36
28: 2015-01-29 48.448999999999998 201501 Credit Agricole 73987.36
Date CDS Period BankName value
修改 2:使用工作日而不是日历日期。
The OP has clarified 他使用的是工作日而不是日历日。规范的这种看似微小的更改对选择要包含的日期的方式产生了严重影响。
现在,总是选择每个月的前 6 个条目以及该月最后一个交易日之前的最后 3 个条目 (ultimo) 以及导致 3 + 1 + 6 = 10 的 ultimo 本身工作日可供选择。
# define range of business days relative to the last trading day (ultimo)
days_before <- 3L
days_after <- 6L
stopifnot(days_before + days_after < 28)
library(data.table)
# read data from dropbox links, note ?dl=1
dailycds <- readRDS(url("https://www.dropbox.com/s/r7v5dq6la0mnn71/dailycds.RDS?dl=1"))
periodicassets <- readRDS(url("https://www.dropbox.com/s/gdflcngwp8nm552/periodicassets.RDS?dl=1"))
# coerce to data.table
setDT(dailycds)[
# filter business dates:
# for each month pick the first days_after business days into the month
# and the last days_before biz days before and including ultimo
dailycds[, c(head(.I, days_after), tail(.I, days_before + 1L)),
by = .(year(Date), month(Date))]$V1][
# compute period by shifting dates from next month into actual month
# coersion to IDate is required because Date is of class POSIXct
, Period := format(as.IDate(Date) - days_after, "%Y%m")][
# right join, dropping all rows from dailycds without matching period
setDT(periodicassets), on = "Period"][]
Date CDS Period BankName value
1: 2015-01-06 48.633000000000003 201412 BPCE 112189.50
2: 2015-01-05 46.670999999999999 201412 BPCE 112189.50
3: 2015-01-02 45.158000000000001 201412 BPCE 112189.50
4: 2015-01-01 47.32 201412 BPCE 112189.50
5: 2014-12-31 47.658000000000001 201412 BPCE 112189.50
6: 2014-12-30 45.843000000000004 201412 BPCE 112189.50
7: 2014-12-29 47.588999999999999 201412 BPCE 112189.50
8: 2014-12-26 47.625999999999998 201412 BPCE 112189.50
9: 2014-12-25 47.697000000000003 201412 BPCE 112189.50
10: 2014-12-24 47.414999999999999 201412 BPCE 112189.50
11: 2015-02-05 47.073999999999998 201501 BPCE 103142.06
12: 2015-02-04 46.634999999999998 201501 BPCE 103142.06
13: 2015-02-03 46.405000000000001 201501 BPCE 103142.06
14: 2015-02-02 47.567 201501 BPCE 103142.06
15: 2015-01-30 47.396000000000001 201501 BPCE 103142.06
16: 2015-01-29 48.448999999999998 201501 BPCE 103142.06
17: 2015-01-28 49.442 201501 BPCE 103142.06
18: 2015-01-27 49.502000000000002 201501 BPCE 103142.06
19: 2015-01-26 49.73 201501 BPCE 103142.06
20: 2015-01-23 50.917000000000002 201501 BPCE 103142.06
21: 2015-01-06 48.633000000000003 201412 Credit Agricole 81618.76
22: 2015-01-05 46.670999999999999 201412 Credit Agricole 81618.76
...
39: 2015-01-26 49.73 201501 Credit Agricole 73987.36
40: 2015-01-23 50.917000000000002 201501 Credit Agricole 73987.36
Date CDS Period BankName value
请注意,结果数据集包含 (3 + 1 + 6) * 2 个月 * 2 个银行 = 40 行。
来自 dropbox 的数据
如果 Dropbox 链接断开:
dailycds <-
structure(list(Date = structure(c(1424649600, 1424390400, 1424304000,
1424217600, 1424131200, 1424044800, 1423785600, 1423699200, 1423612800,
1423526400, 1423440000, 1423180800, 1423094400, 1423008000, 1422921600,
1422835200, 1422576000, 1422489600, 1422403200, 1422316800, 1422230400,
1421971200, 1421884800, 1421798400, 1421712000, 1421625600, 1421366400,
1421280000, 1421193600, 1421107200, 1421020800, 1420761600, 1420675200,
1420588800, 1420502400, 1420416000, 1420156800, 1420070400, 1419984000,
1419897600, 1419811200, 1419552000, 1419465600, 1419379200, 1419292800,
1419206400, 1418947200, 1418860800, 1418774400, 1418688000, 1418601600,
1418342400, 1418256000, 1418169600, 1418083200, 1417996800, 1417737600,
1417651200, 1417564800, 1417478400, 1417392000, 1417132800, 1417046400,
1416960000, 1416873600, 1416787200, 1416528000, 1416441600, 1416355200,
1416268800, 1416182400, 1415923200, 1415836800, 1415750400, 1415664000,
1415577600, 1415318400, 1415232000, 1415145600, 1415059200, 1414972800
), class = c("POSIXct", "POSIXt"), tzone = "UTC"), CDS = c("44.259",
"44.555999999999997", "45.076999999999998", "44.951000000000001",
"45.762", "45.573", "45.634999999999998", "45.956000000000003",
"47.064", "47.51", "48.576999999999998", "47.265000000000001",
"47.073999999999998", "46.634999999999998", "46.405000000000001",
"47.567", "47.396000000000001", "48.448999999999998", "49.442",
"49.502000000000002", "49.73", "50.917000000000002", "51.37",
"52.536999999999999", "49.188000000000002", "47.893999999999998",
"46.728000000000002", "46.634999999999998", "46.366999999999997",
"47.012999999999998", "46.869", "48.121000000000002", "48.625999999999998",
"48.801000000000002", "48.633000000000003", "46.670999999999999",
"45.158000000000001", "47.32", "47.658000000000001", "45.843000000000004",
"47.588999999999999", "47.625999999999998", "47.697000000000003",
"47.414999999999999", "48.075000000000003", "48.085999999999999",
"47.496000000000002", "46.534999999999997", "48.149000000000001",
"49.421999999999997", "48.223999999999997", "47.100999999999999",
"47.484999999999999", "47.491999999999997", "47.052", "46.697000000000003",
"44.670999999999999", "47.706000000000003", "46.835000000000001",
"48.66", "46.841999999999999", "48.069000000000003", "49.49",
"50.155000000000001", "50.155000000000001", "50.49", "52.024000000000001",
"50.33", "50", "50.67", "53.15", "52.994999999999997", "55.31",
"50.82", "50.49", "50.832999999999998", "52.241", "51.97", "52.8",
"50.667000000000002", "51.134999999999998")), .Names = c("Date",
"CDS"), row.names = c(NA, -81L), class = c("tbl_df", "tbl", "data.frame"))
periodicassets <-
structure(list(BankName = c(" BPCE", " BPCE", " Credit Agricole",
" Credit Agricole"), Period = c("201412", "201501", "201412",
"201501"), value = c(112189.50293406, 103142.064337463, 81618.762099507,
73987.36251389)), .Names = c("BankName", "Period", "value"), row.names = c(10L,
11L, 18L, 19L), class = "data.frame")