[R] population variance and sample variance

[Peng Yu]

On Mon, Oct 19, 2009 at 12:53 PM, Kingsford Jones
<kingsfordjones at gmail.com> wrote:
>> sum((x-mean(x))^2)/(n)
> [1] 0.4894708
>> ((n-1)/n) * var(x)
> [1] 0.4894708

But this is not a built-in function in R to do so, right?

> hth,
> Kingsford
>
> On Mon, Oct 19, 2009 at 9:30 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
>> It seems that var() computes sample variance. It is straight forward
>> to compute population variance from sample variance. However, I feel
>> that it is still convenient to have a function that can compute
>> population variance. Is there a population variance function available
>> in R?
>>
>> $ Rscript var.R
>>> set.seed(0)
>>> n = 4
>>> x = rnorm(n)
>>> var(x)
>> [1] 0.6526278
>>> sum((x-mean(x))^2)/(n-1)
>> [1] 0.6526278
>>>
>>
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>