Utility Package
Overview: UTL Package
This chapter describes the various utility object classes that are contained in the UTL package. The purpose of the UTL package is to provide a means for performing basic statistical computations on pairs of actual and predicted time series. The following types of computations are currently supported by the UTL package:
Computation of prediction standard errors and confidence limits for specified actual and predicted time series.
Computation and storing of model forecast fit statistics into CAS tables for specified actual and predicted time series.
Storing of ad hoc numeric variables that are defined in a user program into CAS tables.
The UTL package is object-oriented. To use the UTL package, you must declare instances of the object classes that are contained in the package. Declaring an object instance is the object-oriented equivalent of declaring a program variable. As with simple program variables, the declaration assigns the instance a name of your choosing and a type, which is defined by the object’s class. Unlike simple program variables, the object instance requires a different syntax for interacting with it and offers different functions (methods) that are contextual to the object. The object can offer very sophisticated capabilities with a simple-to-use interface.