Thanks, but I just don't know how to translate that to a dataset with rows and columns. Initially, I was thinking about something like that:
# Create some data: a <- c(10,20,15,43,76,41,25,46) b <- factor(c("m", "w", "m", "w", "m", "w", "m", "w")) c <- c(2,5,8,3,6,1,5,6) number <- c(1:8) myframe <- data.frame(a,b,c, number) # Randomly sample a subset of "numbers": v1 <- sample(number, 4, replace=FALSE) v2 <- number[-v1] # Use the "subset" command like this: firsthalf <- subset(myframe, number=v1) Of course, the last line doesn't work. Is this generally a wrong approach, or is just my writing wrong? -- View this message in context: http://r.789695.n4.nabble.com/Randomly-split-a-sample-in-two-equal-subsamples-tp3021140p3021339.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.