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 3
> b <- a[a$y==0,]
> b
x y
2 2 0
NA NA NA
5 5 0
NA.1 NA NA
NA.2 NA NA
10 10 0
> is(a$y)
[1] "numeric" "vector"
Instead of only pulling the rows where a$y==0, i'm getting where they're 0,
OR NA. ? Again I feel like either something was changed when I wasn't
looking.. or I'm reaaaaaaly forgetting something important.
Thanks,
Robin Jeffries
MS, DrPH Candidate
Department of Biostatistics,
UCLA
530-633-STAT(7828)
rjeffr...@ucla.edu
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