Dear R-helpers, I would like to generate a binary random variable within a stratum's stratum. Here is a simple example.
## x is the first level strata index, here I have 3 strata. x=c(rep(1,5), rep(2,5), rep(3,5)) ## within x, there is a second strata indexed by t=0 and t=1 t=rep(c(0,0,1,1,1),3) ## and within strata i and t=0 and t=1, I generate the random binomial variable respectively, and save in y y=rep(NA, length(x)) for (i in 1:3) { y[(x==i)&(t==0)]=rbinom(2, 1, 0.2) y[(x==i)&(t==1)]=rbinom(3, 1, 0.8) } My question: is there any way to avoid the for loop, since I have the first level strata has thousands of strata. (Within each x stratum, the t only has 2 levels, 0 and 1 ) Thanks for any help! Carrie [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.