Some series might benefit from additional global endogenous terms, such as time-based indicators (year/month/weekday/holiday) or trend/spline functionality. These are "predictors" that are known at all possible times in past + future, and could be included as additional terms in the model matrix by default (or with modifiable options).
Some series might benefit from additional global endogenous terms, such as time-based indicators (year/month/weekday/holiday) or trend/spline functionality. These are "predictors" that are known at all possible times in past + future, and could be included as additional terms in the model matrix by default (or with modifiable options).