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Dear S+ users, I created a trellis graph for a data created by "groupedData command", i.e.,
Dat2_groupedData(logHM~Machine|Subject,data="">
plot(Dat2,inner=~Machine,outer=~Tester*Fit).
Since the data doesn't have a covariate, I have to use this method instead of xyplot and the procedures are well explained in the book entitled "Mixed-Effects Models in S and S-Plus" by Bates and Pinheiro. The Machine has three levels and I'm having difficulty changing the color and size of the symbols for the three levels of Machine. I really appreciate your help.
Kyong U.S. Army
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