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, ]
dat[ind2, ]
I hope it helps.
Best,
Dimitris
Christopher David Desjardins wrote:
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 randomsample1 but then I couldn't figure out how to select those
rows that were not selected and assign them to randomsample2.
Please cc me if you reply as I'm a digest subscriber.
Thanks,
Chris
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