我有一个应该很容易解决的问题,但我根本无法解决。我有一个包含组和变量的庞大数据集。对于该变量,有些组为空(仅填充NA),有些包含值,但也包含NA。
例如:
ID <- c("A1","A1","A1","A1","B1","B1","B1","B1", "B1", "C1", "C1", "C1")
Value1 <- c(0,2,1,1,NA,1,1,NA,1,NA,NA,NA)
data <- data.frame(ID, Value1)
我想将所有NA都更改为零,但仅在包含信息的组中更改。
所以像这样:
ID <- c("A1","A1","A1","A1","B1","B1","B1","B1","B1","C1","C1","C1")
Value1 <- c(0,2,1,1,0,1,1,0,1,NA,NA,NA)
我尝试使用group_by(ID)并以条件max(Value1)>“ replace”> = 0,但max()不能作为条件使用,或者不适用于NA。不幸的是,我在工作中经常需要这种条件,所以我也希望对任何建议有最好的选择,以便有选择地对待团体。
您可以使用简单的if语句,即。
library(dplyr)
library(tidyr)
data %>%
group_by(ID) %>%
mutate(Value1 = if (all(is.na(Value1))){Value1}else{replace_na(Value1, 0)})
给出,
# A tibble: 12 x 2 # Groups: ID [3] ID Value1 <fct> <dbl> 1 A1 0 2 A1 2 3 A1 1 4 A1 1 5 B1 0 6 B1 1 7 B1 1 8 B1 0 9 B1 1 10 C1 NA 11 C1 NA 12 C1 NA
这里是基本的R解决方案
dfout <- Reduce(rbind,
lapply(split(data,data$ID),
function(v) {if (!all(is.na(v$Value1))) v$Value1[is.na(v$Value1)]<- 0; v}))
诸如此类
> dfout
ID Value1
1 A1 0
2 A1 2
3 A1 1
4 A1 1
5 B1 0
6 B1 1
7 B1 1
8 B1 0
9 B1 1
10 C1 NA
11 C1 NA
12 C1 NA
使用dplyr
:
data %>%
group_by(ID) %>%
mutate(Value1 = ifelse(any(!is.na(Value1)) & is.na(Value1), 0, Value1))
# A tibble: 12 x 2
# Groups: ID [3]
ID Value1
<fct> <dbl>
1 A1 0
2 A1 2
3 A1 1
4 A1 1
5 B1 0
6 B1 1
7 B1 1
8 B1 0
9 B1 1
10 C1 NA
11 C1 NA
12 C1 NA
使用data.table
setDT(data)
data[, Value1 := if (all(is.na(Value1))) NA else replace(Value1, is.na(Value1), 0), by = ID]
ID Value1
1: A1 0
2: A1 2
3: A1 1
4: A1 1
5: B1 0
6: B1 1
7: B1 1
8: B1 0
9: B1 1
10: C1 NA
11: C1 NA
12: C1 NA