[R] computing the variance

From: Wang Tian Hua <wangth_at_bii-sg.org>
Date: Mon 05 Dec 2005 - 19:53:00 EST


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



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