Jacques, please try the following:
> z=factor(c('a', 'b','c'))
> z
[1] a b c
Levels: a b c
> x = c(1,2,3)
> y = c(3,2,1)
> xyplot(y~x,groups=z,auto.key=T,asp=diff(range(y))/diff(range(x)))the asp argument takes care of one unit in x being equal to one unit in y. If you add e.g. pch=z to vary symbols, auto.key will have to be replaced by the more complex key argument, see ?xyplot
Color and symbol type are better to distinguish factor variables than size is, so I'd recommend using xyplot rather than bubble (which uses xyplot to plot bubbles) -- Edzer
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