[R] How to shadow 'power' area?

[Greg Snow]

You can look at the power.examp function in the TeachingDemos package to
see if it gives you the graph you want, or look at the code to see how
you could modify it to give you the plot you want.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Andrej Kastrin
> Sent: Monday, June 25, 2007 2:51 PM
> To: R-help
> Subject: [R] How to shadow 'power' area?
> 
> Dear all,
> 
> Suppose I plot two normal distributions (A and B) side by 
> side and add vertical line which hipotheticaly represent 
> alpha value; e.g.:
> 
> x <- seq(-3.5,5, length=1000)
> y <- dnorm(x)
> # Plot distribution A
> plot(y~x, type='l',axes=F,xlab="",ylab="",lwd=2)
> # Plot distribution B
> y2 <- dnorm(x-1.5)
> lines(y2~x,lwd=2)
> # Plot vertical line for alpha value
> abline(h=0)
> segments(qnorm(.5)+1.5,0,qnorm(.5)+1.5,dnorm(qnorm(.5)))
> text(2,0.2,"Power")
> 
> Now I want to shadow area labeled as "Power". Any suggestion 
> how to do that using 'polygon' function?
> 
> Thanks in advance for any suggestion.
> 
> Andrej
> 
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