General Model: The general model is that which does not contain predictors related to time or call type.
Call Create to Enter: The time between a dispatcher receiving the call and entering the information
Call Create to Dispatch: The time between a dispatcher receiving and dispatching the call
Dispatch to Enroute: The time in minutes from when the call is dispatched to when the unit is on its way
Dispatch to On Scene: The time in minutes from when the call is dispatched to when the unit arrives on scene
Enroute to On Scene: The travel time of the unit to arrive on scene \(in minutes\)
To select and fit models for each response, we used the validation set approach described in Chapter 6 of James et al. (2013). Ultimately, this process determines which predictors comprise a model that best predicts a particular response. We considered models with up to third-order continuous terms and interactions between predictors as well as the interaction between the quadratic term for distance from the station and the main effects. The resulting models consist of a subset of the terms we considered.