On 12/18/2009 06:42 AM, changzhu wrote:
I wanted to do a simple plot: Death Rate vs Clinical Site, and then draw a
confidence interval of Death Rate at each clinical site, which is a factor
variable with 100 levels. I used the following code:
plot(Site, Rate, col="red", type="o")
However, the graph was a short line at each site instead of points, and the
color was not red at all. Seem to me for factor variable all options are not
working ! Could anybody help me on how to draw points at each site, with
specific color? if possible, how to further draw confidence interval at each
site?
Hi Changzu,
Since I don't have Site or Rate, I'll have to be imaginative:
Site<-paste(sample(LETTERS,100,TRUE),
sample(letters,100,TRUE),sep="")
SiteOrder<-order(Site)
Rate<-runif(100)
plot(as.numeric(factor(Site))[SiteOrder],
Rate[SiteOrder],col="red",type="o")
Having performed that chicanery, I feel justified in telling you to use
the dispersion function in the plotrix package for the CIs, although
there are many other similar functions.
Jim
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