Message-ID: <3D6FCC84.F16D2B3B@labs.agilent.com>
Date: 2002-08-30T19:50:28Z
From: Jonathan Li
Subject: density() returns a density function that does not add up to 1
Dear R users,
I ran into this curious problem:
> d <- rnorm(100)
> d.density <- density(d)
> sum( d.density$x * d.density$y)
[1] 2.517502
Admittedly the method of computing the mass under the density curve at
line 3 is crude.
But 2.5 is pretty far from 1, the value it should be.
I tried a few other dataset and got similar result. Am I missing
something obvious?
Or is the return of density() not supposed to be normalized?
Thanks in advance!
Jonathan
--
Jonathan Q. Li, PhD
Agilent Technologies Laboratory
Palo Alto, California, USA
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