# [Rd] variance of a scalar (PR#546)

**Uwe Ligges
**
ligges@statistik.uni-dortmund.de

*Fri, 19 May 2000 11:01:29 +0200*

J.C.Rougier@durham.ac.uk wrote:
>*
*>* I was surprised to find that the variance of a scalar, using
*>* var(), is NA. Surely this should be zero?
*
1. This is ok. var(.) is defined as:
var(x)= (1 / (n - 1)) * sum(x - mean(x))^2
^^^^^
If you has got a scalar: n - 1 = 0, so it is undefined!
>*
*>* Version:
*>* platform = sparc-sun-solaris2.7
*>* arch = sparc
*>* os = solaris2.7
*>* system = sparc, solaris2.7
*>* status = Patched
*>* major = 0
*>* minor = 99.0
*
You should upgrade to 1.0.1
Regards,
Uwe Ligges
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