Thanks for your answer.
It's data from two different detection methods. I'd like to show the cases in which the methods detected different viruses as stacked bars and because there are two methods I thought about showing one behind the other. Then, you could see every differing case represented as two bars behind one another that show which viruses were detected respectively.
Thanks for your tip!
That would mean I have to create a mosaic plot for every differing case (wich are 10) instead of one diagramm, wouldn't it? Is it possible to create a mosaic plot in sigmaplot by the way? I couldn't find a proper function for that.
I don't know about Sigmaplot, I've never used it. I am not sure what you mean by "cases" but if you mean "people" or "observations" then, no, why would that be? The mosaic plot is a sort of graphical crosstabulation.