Mathematics, 20.11.2019 05:31 applesass

What is the difference between `lm(y ~ xz)` and `(y ~ i(xz))`, when x and z are both numeric variables?
1. the first one includes an interaction term between x and z, whereas the second uses the product of x and z as a predictor in the model.
2. the second one includes an interaction term between x and z, whereas the first uses the product of x and z as a predictor in the model.
3. the first includes only an interaction term for x and z, while the second includes both interaction effects and main effects.
4. the second includes only an interaction term for x and z, while the first includes both interaction effects and main effects.

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