我是R编程语言的新手。我想知道是否有办法填充我们数据集中仅有一个列的空值。因为我看到的所有填充命令和库都会填充整个数据集中的空值。
我是R编程语言的新手。我想知道是否有办法填充我们数据集中仅有一个列的空值。因为我看到的所有填充命令和库都会填充整个数据集中的空值。
这里是使用Hmisc
包和impute
的示例。
library(Hmisc)
DF <- data.frame(age = c(10, 20, NA, 40), sex = c('male','female'))
# impute with mean value
DF$imputed_age <- with(DF, impute(age, mean))
# impute with random value
DF$imputed_age2 <- with(DF, impute(age, 'random'))
# impute with the media
with(DF, impute(age, median))
# impute with the minimum
with(DF, impute(age, min))
# impute with the maximum
with(DF, impute(age, max))
# and if you are sufficiently foolish
# impute with number 7
with(DF, impute(age, 7))
# impute with letter 'a'
with(DF, impute(age, 'a'))
请查看?impute
,以了解如何实现填补缺失值的具体细节。
impute
的帮助文件(就像我建议的那样!),你会发现可以传递一个函数来执行填充。 - mnellibrary(mice)
#get the nhanes dataset
dat <- mice::nhanes
#impute it with mice
imp <- mice(mice::nhanes, m = 3, print=F)
imputed_dataset_1<-complete(imp,1)
head(imputed_dataset_1)
# age bmi hyp chl
# 1 1 22.5 1 118
# 2 2 22.7 1 187
# 3 1 30.1 1 187
# 4 3 24.9 1 186
# 5 1 20.4 1 113
# 6 3 20.4 1 184
#Now, let's see what methods have been used to impute each column
meth<-imp$method
# age bmi hyp chl
#"" "pmm" "pmm" "pmm"
#The age column is complete, so, it won't be imputed
# Columns bmi, hyp and chl are going to be imputed with pmm (predictive mean matching)
#Let's say that we want to impute only the "hyp" column
#So, we set the methods for the bmi and chl column to ""
meth[c(2,4)]<-""
#age bmi hyp chl
#"" "" "pmm" ""
#Let's run the mice imputation again, this time setting the methods parameter to our modified method
imp <- mice(mice::nhanes, m = 3, print=F, method = meth)
partly_imputed_dataset_1 <- complete(imp, 3)
head(partly_imputed_dataset_1)
# age bmi hyp chl
# 1 1 NA 1 NA
# 2 2 22.7 1 187
# 3 1 NA 1 187
# 4 3 NA 2 NA
# 5 1 20.4 1 113
# 6 3 NA 2 184
library("VIM")
kNN(sleep, variable = c("NonD","Gest"))
library(imputeTS)
na_kalman(tsAirgap)