This class is a wrapper around the formula
class. It is not intended for
users to directly manipulate and create new objects.
raw_formula
[formula] The raw formula call
translated_formula
[formula] The translated formula call ready to be evaluated.
vars
[list] List of relevant variables for the evaluation of the different smooths.
lag_vars
Smooth lag variables used for predictions
response
[charatcer] The response variable in the formula.
is_fitted
[logical] Whether this formula has already been fitted.
See the mgcv
function for defining smooths: s().