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Suppose you are using R and have data stored in a data frame, M. Then I know that
g <- glm(Y ~ ., data=M)
will automatically fit a model where Y is the dependent variables and all other columns of M are the predictors. Is there an analogously simple way to additionally include every two way interaction?
You can do two-way interactions simply using
.*.and arbitrary n-way interactions writing.^n.formula(g)will tell you the expanded version of the formula in each of these cases.