hi, when i was computing the variance of a simple vector, i found unexpect result. not sure whether it is a bug. > var(c(1,2,3)) [1] 1 #which should be 2/3. > var(c(1,2,3,4,5)) [1] 2.5 #which should be 10/5=2 it seems to me that the program uses (sample size -1) instead of sample size at the denominator. how can i rectify this? regards, tianhua