st: overlaid twoway graph, move bars

[Martina Brandt <m.s.brandt@web.de>]

is it possible to shift the bars against each other in an overlaid graph 
like this:


twoway (bar mean1 land if mum==1, horizontal fcolor(black)lcolor(black))
(bar mean2 land if mum==1, horizontal fcolor(none) lcolor(gray))
(bar mean3 land if dad==1, horizontal fcolor(black) lcolor(black))
(bar mean4 land if dad==1, horizontal fcolor(none) lcolor(gray)),
ytitle(, orientation(horizontal)) xlabel(-80 "80" -70 "70" -60 "60" -50 
"50" -40 "40" -30 "30" -20 "20" -10 "10" 0(10)80);



- so you are able to see both bars in every category where one group is 
not a subset of the other (the bars that are longer differ per category).


thanks in advance!

martina
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