[R] density ranges for uniform law
Ott Toomet
otoomet at econ.dk
Tue Apr 8 10:41:58 CEST 2003
Hi,
 From: ZABALZAMEZGHANI Isabelle <Isabelle.ZABALZAMEZGHANI at ifp.fr>
 Date: Tue, 8 Apr 2003 10:21:45 +0200
 Hello,

 I would have some details and explanations about the results I get.
 In fact, I start with a uniform sample between 1 and 1, and then plot its
 density.
 My problem is that the density ranges are much more longer than I expected :

 samp < runif(10000,1,1)
 plot(density(samp))

 Instead of varying between 1 and 1, the density varies between approximaly
 1.5 and 1.5
The density is positive in the interval about (1.3, 1.3) using the
default bandwidth. Its value is around 0.5. I guess you should try
to change bandwidth. Try
> plot(density(samp, bw=0.1))
> lines(density(samp, bw=0.03), col=2)
> lines(density(samp, bw=0.01), col=3)
best wishes,
Ott
 Could someone explain me what is happening ? Maybe some arguments for
 density estimation need to be set ?

 Isabelle.
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