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...raction term is significant then we take that into account? Does that mean that the odds ratio of the interaction is exp(0.25847)*exp(0.13630)*exp(0.85407)=3.486297 ? Or do we use additions? Thanks. -- View this message in context: http://www.nabble.com/Logistic-regression-for-drugs-Interactions-tf3404506.html#a9482343 Sent from the R help mailing list archive at Nabble.com.