如何在R中的glm模型中自动包含所有双向交互

Question

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?

Answer 1

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.