Suppose i have matrix z
id<-c(1,2,3,4,5)
a <- c(4, 3, 2, NA, 1)
b <- c(3, NA, 2, 7, 1)
c <-c(3, NA, NA, 7, NA)
z<- cbind(id,a, b,c)
id a b c
[1,] 1 4 3 3
[2,] 2 3 NA NA
[3,] 3 2 2 NA
[4,] 4 NA 7 7
[5,] 5 1 1 NA
I want to select those columns for which I have the smallest number of NA
In my example, these would be column1 and 2
since they give me
4 3
2 2
1 1
My real example have alot of columns and I want to find and save all
possible subsets
Thanks, alot
Evgenia
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