sorry, I've managed to find a (partial) solution to my problem (even not much
elegant);
now what is left out is the proper tweaking of labels...
any better solutions?
dotplot(variety ~ yield | site, data = barley,
layout = c(1,6),
index.cond= function(x,y){median(x)},
panel = function(x,y,...) {
panel.dotplot(x,y,...)
median.values <- median(x)
panel.abline(v=median.values, col.line="red")
mean.values<-mean(x)
panel.abline(v=mean.values, col.line="blue")
panel.text(x=median.values,y=mean(as.numeric(y)),
labels=round(median.values,0),col="red",pos=1,...)
panel.text(x=mean.values,y=mean(as.numeric(y)),
labels=round(mean.values,0),col="blue",pos=1,...)
})
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