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...ions expect the 4 way (A:B:C:D) is there an easy way of doing this? I then want to step down the model eliminating the non-significant terms I understand step() does this but how would I do it by hand? -- View this message in context: http://www.nabble.com/R-stepping-through-multiplie-interactions-tp21629339p21629339.html Sent from the R help mailing list archive at Nabble.com.