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...hase, H3: equal rhythmic components). I suppose I have to use dummy variables, but I don’t know how to do it.   I could access something similar in a solution manual of  a Weisberg book (1985), chapter 6, problem 9, as follows: m1 <- lm(Yvar~ Xvar + Fvar + Fvar:Xvar, na.action=na.omit, weights=theWeights)  # this is model 1 the most general m2 <- lm(Yvar~ Xvar + Fvar            , na.action=na.omit, weights=theWeights)  # this is model 2 parallel m3 <- lm(Yvar~ Xvar + Fvar:Xvar       , na.action=na.omit, weights=theWeights)  # this is model 3 common intercept m4 <- lm(Yvar~ Xvar          ...