Re: [R] Randomly split a sample in two equal subsamples
Hi Yoan, Please try ?sample. Suppose you have 1:n ids of total observations where n is even, you want to randomly split it into two subsamples, the following code should work. n - 20 one.sample - sort(sample(1:n, n/2)) another.sample - (1:n)[-one.sample] Good luck. Wu - A R learner. -- View this message in context: http://r.789695.n4.nabble.com/Randomly-split-a-sample-in-two-equal-subsamples-tp3021140p3021257.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.
Re: [R] Randomly split a sample in two equal subsamples
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.
Re: [R] Randomly split a sample in two equal subsamples
firsthalf - myframe[v1,] or firsthalf - subset(myframe, number %in% v1) - A R learner. -- View this message in context: http://r.789695.n4.nabble.com/Randomly-split-a-sample-in-two-equal-subsamples-tp3021140p3021353.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.
Re: [R] Randomly split a sample in two equal subsamples
Thanks, it works! -- View this message in context: http://r.789695.n4.nabble.com/Randomly-split-a-sample-in-two-equal-subsamples-tp3021140p3021365.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.
