Yes.
Beating a pretty weary horse, a slightly cleaner version of my prior
offering using with(), instead of within() is:
with(dat,
dat[sampleNo[sample(var1[!var1%%2 & !sampleNo], 10, rep=FALSE)],
"sampleNo"] <- 2)
with() and within() are convenient ways to avoid having to repeatedly name
the col
Hi David,
I was about to post a reply when Bert responded. His answer is good
and his comment to use the name 'dat' rather than 'data' is instructive.
I am providing my suggestion as well because I think it may address
what was causing you some confusion (mainly to use "which", but also
the missing
For personal aesthetic reasons, I changed the name "data" to "dat".
Your code, with a slight modification:
set.seed (1357) ## for reproducibility
dat <- data.frame(var1=seq(1:40), var2=seq(40,1))
dat$sampleNo <- 0
idx <- sample(seq(1,nrow(dat)), size=10, replace=F)
dat[idx,"sampleNo"] <-1
## yi
Hello everybody!
I have the following problem: I'd like to select a sample from a subsample
in a dataset. Actually, I don't want to select it, but to create a new
variable sampleNo that indicates to which sample (one or two) a case
belongs to.
Lets suppose I have a dataset containing 40 cases:
d
4 matches
Mail list logo
