How to select rows by group with the minimum value and containing NAs in R

Question

Here is an example:

set.seed(123)    
data<-data.frame(X=rep(letters[1:3], each=4),Y=sample(1:12,12),Z=sample(1:100, 12))
data[data==3]<-NA
         


        

Answer 1

There is a data.table way

library(data.table)
set.seed(123)    
data<-data.frame(X=rep(letters[1:3], each=4),Y=sample(1:12,12),Z=sample(1:100, 12))
data[data==3]<-NA
data <- data.table(data)
data[data[,.I[which.min(Y)], by = "X"][,V1]]