[R] How to shadow 'power' area?

From: Andrej Kastrin <andrej.kastrin_at_siol.net>
Date: Mon, 25 Jun 2007 22:50:59 +0200


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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