On Tue, Feb 2, 2010 at 10:25 AM, Peng Yu <pengyu...@gmail.com> wrote: > On Mon, Oct 19, 2009 at 12:53 PM, Kingsford Jones > <kingsfordjo...@gmail.com> wrote: >>> sum((x-mean(x))^2)/(n) >> [1] 0.4894708 >>> ((n-1)/n) * var(x) >> [1] 0.4894708 > > But this is not a built-in function in R to do so, right?
No because down that path lies bloat.... > >> hth, >> Kingsford >> >> On Mon, Oct 19, 2009 at 9:30 AM, Peng Yu <pengyu...@gmail.com> wrote: >>> It seems that var() computes sample variance. It is straight forward >>> to compute population variance from sample variance. However, I feel >>> that it is still convenient to have a function that can compute >>> population variance. Is there a population variance function available >>> in R? >>> >>> $ Rscript var.R >>>> set.seed(0) >>>> n = 4 >>>> x = rnorm(n) >>>> var(x) >>> [1] 0.6526278 >>>> sum((x-mean(x))^2)/(n-1) >>> [1] 0.6526278 >>>> >>> >>> ______________________________________________ >>> 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. >>> >> > > ______________________________________________ > 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. > ______________________________________________ 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.
