Define: "Absolutely random"; "systematic differences" (All pseudorandom numbers are by definition generated by a deterministic algorithm from a possibly random starting seed set).
On Wed, Aug 15, 2012 at 9:11 AM, <saschav...@gmail.com> wrote: > Hello, > > Vector y is an alphabetically sorted version of vector x. Will both samples, > X and Y, be "absolutely" random or will they have systematic differences? > And: Should I sort or shuffle a vector before sampling? No. -- Bert > > Thank you, *S* > > x <- as.factor(LETTERS[sequence(10:1)]) > y <- sort(x) > X <- sample(x, 5) > Y <- sample(y, 5) > > > -- > Sascha Vieweg, saschav...@gmail.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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.
