Hi Katie, maybe the easiest solution is to create a new factor that corresponds to the combinations of the three factors A, B and C. A quick and dirty way to create such a factor is:
ABC <- factor(paste(A, "x", B, "x", C, sep = "")) ABC and then fit the model using the variable ABC instead of A*B*C. Christian ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
