When using `gam()`

to model outcome as an additive function of the inputs, you can use the `s()`

function inside formulas to designate that you want to use a spline to model the non-linear relationship of a continuous variable to the outcome.

Suppose that you want to predict how much weight (`Wtloss`

) a dieter will lose over a 2-year diet plan as a function of:

`Diet`

type (categorical)`Sex`

(categorical)`Age`

at beginning of diet (continuous)`BMI`

(body mass index) at beginning of diet (continuous)

You do not want to assume that any of the relationships are linear.

Which is the most appropriate formula?

50 XP

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