Dear all, Suppose I have a dataset like below, then I take for example, 100 random sample "class" variable where contains "yes" and "no" respectively, 70% and 30%. I need a new 100 random sample from mydat dataset, but I can't get the result. Thanks you very much for any helps. Best, Muhammad Subianto
mydat <- data.frame(size=c(30,12,15,10,12,12,25,30,20,14), A=c(0,1,0,1,0,1,1,1,0,0), B=c(1,1,0,1,0,1,1,0,0,1), C=c(0,0,1,1,0,0,1,1,0,0), D=c(1,1,1,1,0,1,0,0,1,1), E=c(1,1,0,1,1,1,1,1,1,0), Class=c("yes","yes","no","yes","yes","no","yes","no","yes","yes")) mydat # Maximal data from dataset max.size <- sum(mydat$size);max.size # I need sample random nof.sample <- 100 set.seed(123) sample.class <- sample(c("yes","no"), nof.sample, prob=c(.7, .3), replace=TRUE) sample.class sampledat.class <- mydat[sample.class,] sampledat.class ______________________________________________ R-help@stat.math.ethz.ch 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.