[R] how to plot density distribution with a arrow pointer?

[Hu Chen]

Thanks.
A small arrow may be more nice-looking than a long cutting line.
and, another question,
how to get the p-value of the position of X0?
If the whole distribution is not as regular as norm, chi-square but a
strange one, how could I get the X0's p-value?

any functions?

Thanks very much.

On 6/15/05, Jim Brennan <jfbrennan at rogers.com> wrote:
> This is one way not so good
> R>X<-rnorm(1000000)
> R>X0<-.899
> R>plot(density(X))
> R>abline(v=X0)
> 
> A better way
> 
> R>x<-seq(-5,5,.01)
> R>plot(x,dnorm(x))
> R>plot(x,dnorm(x),type="l",col=2)
> R>abline(v=X0,col=4)
> R>?text
> R>text(X0,.2,paste("P(X<X0) =",signif(pnorm(X0),3)),pos=2)
> R>abline(v=X0,col=4)
> 
> If you actually want arrows do ?arrows
> Jim
> 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Hu Chen
> Sent: June 15, 2005 10:41 AM
> To: R
> Subject: [R] how to plot density distribution with a arrow pointer?
> 
> Hi all,
> for example:
> > X<- rnorm(1000)
> > X0 <- 0.899
> 
> I want to draw a density distribution plot with a arrow pointer
> indicating the position of X0, meanwhile, giving out the p-value.
> 
> any functions?
> 
> Thanks very much.
> 
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