Hei, I have a formula for a model as follows lm(TS~log(BodyWt)+log(BodyWt):factor(D). I do not use R for programming hence I dont understand what is the second covariate in the model "log(BodyWt):factor(D)". Where BodyWt = body weight and D = danger index (either 1 or 2). I want to run the same model in other program. Can anyone explain me what is doing the : operator and the factor() function.
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