我有一个data.table DT,其current(F0YR)和next(F1YR)会计年度末(FYE)编码为整数.由于每个下一个FYE最终将成为当前的FYE,因此整数将在列F1YR和中F0YR.此外,我的数据包含每月观察,因此相同的FYE将多次出现在数据集中:
library(data.table)
DT <- data.table(ID = rep(c("A", "B"), each=9),
MONTH = rep(100L:108L, times=2),
F0YR = rep(c(1L, 4L, 7L), each=3, times=2),
F1YR = rep(c(4L, 7L, 9L), each=3, times=2),
value = c(rep(1:5, each=3), 6, 6, 7),
key = "ID,F0YR")
DT
ID MONTH F0YR F1YR value
[1,] A 100 1 4 1
[2,] A 101 1 4 1
[3,] A 102 1 4 1
[4,] A 103 4 7 2
[5,] A …