[R] Area of density

[Duncan Murdoch]

On 05/09/2008 4:32 PM, pragmatic wrote:
> Hello!
> Please, anybody help me.
> 
> Can I calculate area of density was created by:
>> D <- density(x)
> In other words I want to know area under curve 'plot(D)'

That should be 1.

> and It's good to calculate area before and after 0 separately.

That's harder, but a good approximation should be sum(x < 0)/length(x) 
and sum(x > 0)/length(x).

Duncan Murdoch