[R] calculating standard deviation and variance

[David Freedman]

The gplots package might help.  Try:

library(gplots)
data(state)
plotmeans(state.area ~ state.region) 

hth,
David Freedman

johnhj wrote:
> 
> Hiii,
> 
> I have some problems to plot "standard deviation and variance" from a
> texfile.
> 
> Ich have the following code so far:
> 
> x <-read.table(file="new.txt")   
> 
> x$gruppe <- 100*rep(1:36, each=20)
> 
> png(filename = "D:/Uni/new.png", width = 640, height = 480,pointsize = 12,
> bg = "white")
> 
> boxplot(V3 ~ gruppe, data = x, col = "blue",boxwex=0.7,ylab
> ="Datenrate(MBit(sec))",xlab = "Zeit(sec)")
> 
> dev.off() 
> 
> My question is, how can I plot the standard deviation and variance of
> "x$gruppe <- 100*rep(1:36, each=20)"
> 
> Can anybody help me please ?
> 
> greetings,
> johnh
> 

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