Re: [R] Randomly splitting a data frame in half

Thanks that makes perfect sense! Chris On 3/19/09 1:17 PM, Dimitris Rizopoulos wrote: well, you need to keep track of the rows you sampled, e.g., dat <- data.frame(x = rnorm(20), y = rnorm(20), w = rnorm(20)) ii <- seq_len(nrow(dat)) ind1 <- sample(ii, 10) ind2 <- ii[!ii %in% ind1] dat[ind1, ]

Re: [R] Randomly splitting a data frame in half

well, you need to keep track of the rows you sampled, e.g., dat <- data.frame(x = rnorm(20), y = rnorm(20), w = rnorm(20)) ii <- seq_len(nrow(dat)) ind1 <- sample(ii, 10) ind2 <- ii[!ii %in% ind1] dat[ind1, ] dat[ind2, ] I hope it helps. Best, Dimitris Christopher David Desjardins wrote: I

[R] Randomly splitting a data frame in half

I have a data frame in long format and I would like to randomly divide this data frame in half. The data frame consists of 39622 rows and I initially tried ... randomsample1 <- data[sample(nrow(data),19811), ] Where allows me to randomly select half of the rows and assign them to randomsample