On Mon, Mar 8, 2010 at 3:44 PM, casperyc <caspe...@hotmail.co.uk> wrote: > > Hi Rolf Turner , > > God, it directed to the wrong page. > > I firstly find the formula in wiki, than tried to verify the answer in R, > now, given that 143/12 ((n^2-1)/12 ) is the correct answer for a discrete > uniform random variable, > I am still not sure what R is calculating there? > why it gives me 13?
Of RT's two points, you addressed (b) continuous vs. discrete, but you have yet to address (a) population estimate based on a sample. Hint: var(1:12) tries to estimate the population variance based on a sample. You are interested in the population variance. They are calculated different formulas that differ *only in the denominator*. Michael > > Thanks! > -- > View this message in context: > http://n4.nabble.com/variance-of-discrete-uniform-distribution-tp1585328p1585355.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. ______________________________________________ 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.
