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...how can I interpret the estimates? also if using as.factor is a good way, is there any difference with doing dummy coding for categorical variable and then running regression? Thanks. -- View this message in context: http://r.789695.n4.nabble.com/using-categorical-variable-in-multiple-regression-tp3591517p3591517.html Sent from the R help mailing list archive at Nabble.com.