Thank you Sticky. I tried your suggestion. However, it doesn't work for me. May I ask one more question, about how to generate a graph with several rows that show several "response" variables, e.g. response 1, response2..., they have the same category variable (dose) and also x axes. If it is possible, the graph will like lattice panels. however, classification panels only allow the use of class variables. I found neither LAYOUT DATAPANEL nor LAYOUT DATALATTICE could achieve the purpose. thanks. K
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