[R] Area of density

Duncan Murdoch murdoch at stats.uwo.ca
Sat Sep 6 00:39:42 CEST 2008

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

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