R 带条件的正向填充数据
我有一个数据帧,DF,看起来像这样:R 带条件的正向填充数据,r,na,R,Na,我有一个数据帧,DF,看起来像这样: date permno ret sue bm gpa 1 202001 10000 0.01 0.4 0.4 NA 2 202002 10000 0.04 NA NA 0.5 3 202003 10000 -0.01 NA NA NA 4 202004 10000 0.00 1.3 0.5 NA 5 202005 10000 0.02 NA NA 0.3 6 202006 10000 0.01
date permno ret sue bm gpa
1 202001 10000 0.01 0.4 0.4 NA
2 202002 10000 0.04 NA NA 0.5
3 202003 10000 -0.01 NA NA NA
4 202004 10000 0.00 1.3 0.5 NA
5 202005 10000 0.02 NA NA 0.3
6 202006 10000 0.01 NA NA NA
7 202007 10000 0.03 NA NA NA
8 202008 10000 -0.02 NA NA 0.4
9 202001 11000 0.05 0.1 0.3 NA
10 202002 11000 0.02 NA NA NA
11 202003 11000 0.01 NA NA NA
12 202004 11000 0.00 NA NA 0.3
13 202005 11000 0.01 NA NA NA
14 202006 11000 -0.01 NA NA NA
15 202007 11000 0.04 0.5 0.4 NA
16 202008 11000 0.30 NA NA NA
date permno ret sue bm gpa
1 202001 10000 0.01 0.4 0.4 NA
2 202002 10000 0.04 0.4 0.4 0.5
3 202003 10000 -0.01 0.4 0.4 0.5
4 202004 10000 0.00 1.3 0.5 0.5
5 202005 10000 0.02 1.3 0.5 0.3
6 202006 10000 0.01 1.3 0.5 0.3
7 202007 10000 0.03 1.3 0.5 0.3
8 202008 10000 -0.02 NA NA 0.4
9 202001 11000 0.05 0.1 0.3 NA
10 202002 11000 0.02 0.1 0.3 NA
11 202003 11000 0.01 0.1 0.3 NA
12 202004 11000 0.00 0.1 0.3 0.3
13 202005 11000 0.01 NA NA 0.3
14 202006 11000 -0.01 NA NA 0.3
15 202007 11000 0.04 0.5 0.4 0.3
16 202008 11000 0.30 0.5 0.4 NA
我使用此代码正向填充变量sue、bm和gpa:
DF1 <-
DF %>%
arrange(permno,date) %>%
group_by(permno) %>%
mutate_at(vars(c(sue,bm,gpa)), funs(na.locf(.,na.rm=FALSE)))
我想对数据提前填充的月份设置一个限制。我想将这三个变量向前填充,直到下一个可用值,但最多3个月。因此,结果应如下所示:
date permno ret sue bm gpa
1 202001 10000 0.01 0.4 0.4 NA
2 202002 10000 0.04 NA NA 0.5
3 202003 10000 -0.01 NA NA NA
4 202004 10000 0.00 1.3 0.5 NA
5 202005 10000 0.02 NA NA 0.3
6 202006 10000 0.01 NA NA NA
7 202007 10000 0.03 NA NA NA
8 202008 10000 -0.02 NA NA 0.4
9 202001 11000 0.05 0.1 0.3 NA
10 202002 11000 0.02 NA NA NA
11 202003 11000 0.01 NA NA NA
12 202004 11000 0.00 NA NA 0.3
13 202005 11000 0.01 NA NA NA
14 202006 11000 -0.01 NA NA NA
15 202007 11000 0.04 0.5 0.4 NA
16 202008 11000 0.30 NA NA NA
date permno ret sue bm gpa
1 202001 10000 0.01 0.4 0.4 NA
2 202002 10000 0.04 0.4 0.4 0.5
3 202003 10000 -0.01 0.4 0.4 0.5
4 202004 10000 0.00 1.3 0.5 0.5
5 202005 10000 0.02 1.3 0.5 0.3
6 202006 10000 0.01 1.3 0.5 0.3
7 202007 10000 0.03 1.3 0.5 0.3
8 202008 10000 -0.02 NA NA 0.4
9 202001 11000 0.05 0.1 0.3 NA
10 202002 11000 0.02 0.1 0.3 NA
11 202003 11000 0.01 0.1 0.3 NA
12 202004 11000 0.00 0.1 0.3 0.3
13 202005 11000 0.01 NA NA 0.3
14 202006 11000 -0.01 NA NA 0.3
15 202007 11000 0.04 0.5 0.4 0.3
16 202008 11000 0.30 0.5 0.4 NA
有人知道我如何在R中做到这一点吗?这听起来像是一个滚动窗口的东西。但是,由于需要限制结转,一个问题是当您查看特定单元格时,它的前一个单元格已经被修复(un-
NA
'd),因此我们需要查看rev
中的向量
助手函数,其中2:4
基于您不超过三个月的偏好。在反向rollappy
的情况下,z[1]
在这种情况下很可能是NA
,其中z[2:4]
是前三个月
func我们可以编写自己的na.locf()
,允许您进行所需的调整:
代码
library(zoo)
library(dplyr)
na.locf2 <- function(object, period = 3, ...){
# consecutive NAs
tmp1 <- rle(is.na(object))
# NA count in the length of the vector
tmp2 <- unlist(sapply(tmp1[[1]] , function(x){
1:x
}))
# remove all NAs
tmp3 <- na.locf(object, ...)
# reassign those that are greater than the desired period
tmp3[tmp2 > period] <- NA
# return
tmp3
}
# Then
DF %>%
arrange(permno,date) %>%
group_by(permno) %>%
mutate_at(vars(c(sue,bm,gpa)), funs(na.locf2(.,na.rm=FALSE)))
# Yields
# A tibble: 16 x 6
# Groups: permno [2]
# date permno ret sue bm gpa
# <int> <int> <dbl> <dbl> <dbl> <dbl>
# 1 202001 10000 0.01 0.4 0.4 NA
# 2 202002 10000 0.04 0.4 0.4 0.5
# 3 202003 10000 -0.01 0.4 0.4 0.5
# 4 202004 10000 0 1.3 0.5 0.5
# 5 202005 10000 0.02 1.3 0.5 0.3
# 6 202006 10000 0.01 1.3 0.5 0.3
# 7 202007 10000 0.03 1.3 0.5 0.3
# 8 202008 10000 -0.02 NA NA 0.4
# 9 202001 11000 0.05 0.1 0.3 NA
# 10 202002 11000 0.02 0.1 0.3 NA
# 11 202003 11000 0.01 0.1 0.3 NA
# 12 202004 11000 0 0.1 0.3 0.3
# 13 202005 11000 0.01 NA NA 0.3
# 14 202006 11000 -0.01 NA NA 0.3
# 15 202007 11000 0.04 0.5 0.4 0.3
# 16 202008 11000 0.3 0.5 0.4 NA
图书馆(动物园)
图书馆(dplyr)
不,这是有效的。谢谢