The goal of model validation is to determine whether or not the estimatedmodel accurately reflects the actual system. Using the model orders foundin the User-Defined Criterion section, you can simulate and predict theresponse of the system. You can compare these responses to the actualresponse and determine the accuracy of the estimated model. You also cananalyze the residuals to determine the accuracy of the estimated model.Refer to the Validating Models section of Chapter 8, Analyzing, Validating,and Converting Models, for more information about validating a model.The following sections describe how to apply these techniques to modelvalidation.