[R] Overlaying graphs
Paul Meagher
paul at datavore.com
Wed Sep 3 18:18:42 CEST 2003
I am wanting to construct a probability distribution for height and then,
hopefully, visually and analytically demonstrate that it is normally
distributed.
These are the commands I have developed so far:
fat <- read.table("fat.dat", header=TRUE)
mu <- mean(fat$height)
sdev <- sd(fat$height)
hist(fat$height, br=20, freq=FALSE, xlab="Male Height in Inches")
curve(dnorm(x, mu, sdev), from=64, to=78)
I do not know how to overlay the curve graphic on top of hist graphic.
I am hoping to show visually that the normal curve overlays the obtained
probability distribution when plotted on the same graph. Unfortunately, I
an not sure how to overlay them. Can anyone point me in the right direction
or show me the code.
The data set is here:
http://www.datavore.com/fat.dat
Regards,
Paul Meagher
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