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Development Of An Efficient Algorithm For Model Structure Selection In System Identification.

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ABSTRACT

System identification is a field of study involving the derivation of a

mathematical model to explain the dynamical behaviour of a system. One of the steps in

system identification is model structure selection which involves the selection of

variables and terms of a model. Several important criteria for a desirable model structure

include its accuracy in future prediction and model parsimon y. A parsimonious model

structure is desirable in enabling easy control desi gn. Two methods of model structure

selection are closely looked into and these are deterministic mutation algorithm (DMA)

and forward selection procedure. The DMA is known to be originated from evolutionary

computation whereas forward selection procedure may be listed under the study of

regression. They have close similarities in characteristics, more specifically known as

forward search in model structure selection. However, both also function in a

population-based optimization and statistical approaches, respectively. Due to the

closeness, this research attempts to clarify the advantages and disadvantages of both

methods through model structure selection of difference equation model in system

identification . Simulated and real data were used . To allow for fair comparison, DMA

was altered so as to equalize its strength, where applicable, to that of forward selection

procedure. It was found out that DMA not only has the advantage of simpler procedure

but it also superceded the performance of forward selection procedure, even with a

handicapped alteration.

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