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...result2<-step(result) I always get the same results as from glm without a stepwise approach. So obviously R can't handle this if you put a list in. How can I make this work? Thanks in advance, Anna -- View this message in context: http://www.nabble.com/Handle-lot-of-variables---Regression-tp25889056p25889056.html Sent from the R help mailing list archive at Nabble.com.