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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--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
