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reaaaaaaly
2012 Aug 15
3
Subsetting with missing data
Simply put, I want to subset the data frame 'a' where 'y=0'.
> a <- as.data.frame(cbind(x=1:10, y=c(1,0,NA,1,0,NA,NA,1,1,0)))
> a
x y
1 1 1
2 2 0
3 3 NA
4 4 1
5 5 0
6 6 NA
7 7 NA
8 8 1
9 9 1
10 10 0
> names(a)
[1] "x" "y"
> table(a$y)
0 1
3 4
> table(a$y, useNA="always")
0 1 <NA>
3 4