Model Validation Criteria for System Identification in Time Domain

Abstract

Fit ratio is one of the most popular criteria that evaluates a result of system identification in the time domain. This criterion is constructed by Root Mean Squared Error (RMSE) divided by the standard deviation of the measured signal. However the validity of fit ratio have not been discussed actively in the field of system identification. In this paper, we introduce some discussion about criteria like fit ratio from the field of physical geography. Then, we evaluated these criteria through two case studies. As a result, we found that fit ratio was not adequate for evaluation of the result of system identification.