[EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > I am an "R" newbie. I have a problem with computing a variance > on a vector. > > > data(cars) variance <- function (x) mean(x^2)-mean(x)^2; > > variance(cars[,1]) > [1] 27.4 > > var(cars[,1]) > [1] 27.95918 > > What did I assume/understand wrong ?
You wrongly assumed that the 'var' help file would not help. However, that page states that the denominator n-1 is used. > 27.4*50/49 [1] 27.95918 -- Philippe ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
