Dear all,

I'm trying to use "scatterplot" from package "car" to get a scatterplot with
row-names as labels and I want my data to be divided into two groups defined
by the column "tresh". Leaving away the groups-command gives me the right
labels but they are not distinguished by colors according to "tresh". Does
anybody know why the following example doesn't work?

Prestige2 <- transform(Prestige,thresh=(income>5000))
attach(Prestige2)
scatterplot(income~education,data=Prestige2,
            xlab="Education",ylab="Income",cex.lab=1.2,
            smooth=TRUE,spread=FALSE,reg.line=TRUE,lwd=2,
            groups=thresh,by.groups=TRUE,legend.plot=TRUE,
            id.n=nrow(Prestige),id.cex=0.8)

Cheers,
Erich

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