Bayesian model order selection for nonlinear system function expansions.
Orthonormal function expansions have been used extensively in the context of linear and nonlinear systems identification, since they result in a significant reduction in the number of required free parameters. In particular, Laguerre basis expansions of Volterra kernels have been used successfully f...
| Main Authors: | , |
|---|---|
| Formato: | Journal article |
| Idioma: | English |
| Publicado: |
2008
|
| _version_ | 1826268153141788672 |
|---|---|
| author | Mitsis, G Jbabdi, S |
| author_facet | Mitsis, G Jbabdi, S |
| author_sort | Mitsis, G |
| collection | OXFORD |
| description | Orthonormal function expansions have been used extensively in the context of linear and nonlinear systems identification, since they result in a significant reduction in the number of required free parameters. In particular, Laguerre basis expansions of Volterra kernels have been used successfully for physiological systems identification, due to the exponential decaying characteristics of the Laguerre orthonormal basis and the inherent nonlinearities that characterize such systems. A critical aspect of the Laguerre expansion technique is the selection of the model structural parameters, i.e., polynomial model order, number of Laguerre functions in the expansion and value of the Laguerre parameter alpha, which determines the rate of exponential decay. This selection is typically made by trial-and-error procedures on the basis of the model prediction error. In the present paper, we formulate the Laguerre expansion technique in a Bayesian framework and derive analytically the posterior distribution of the alpha parameter, as well as the model evidence, in order to infer on the expansion structural parameters. We also demonstrate the performance of the proposed method by simulated examples and compare it to alternative statistical criteria for model order selection. |
| first_indexed | 2024-03-06T21:05:15Z |
| format | Journal article |
| id | oxford-uuid:3c35cbd2-40ea-47e1-8cef-8dbb4af28cd7 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:05:15Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:3c35cbd2-40ea-47e1-8cef-8dbb4af28cd72022-03-26T14:12:21ZBayesian model order selection for nonlinear system function expansions.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:3c35cbd2-40ea-47e1-8cef-8dbb4af28cd7EnglishSymplectic Elements at Oxford2008Mitsis, GJbabdi, SOrthonormal function expansions have been used extensively in the context of linear and nonlinear systems identification, since they result in a significant reduction in the number of required free parameters. In particular, Laguerre basis expansions of Volterra kernels have been used successfully for physiological systems identification, due to the exponential decaying characteristics of the Laguerre orthonormal basis and the inherent nonlinearities that characterize such systems. A critical aspect of the Laguerre expansion technique is the selection of the model structural parameters, i.e., polynomial model order, number of Laguerre functions in the expansion and value of the Laguerre parameter alpha, which determines the rate of exponential decay. This selection is typically made by trial-and-error procedures on the basis of the model prediction error. In the present paper, we formulate the Laguerre expansion technique in a Bayesian framework and derive analytically the posterior distribution of the alpha parameter, as well as the model evidence, in order to infer on the expansion structural parameters. We also demonstrate the performance of the proposed method by simulated examples and compare it to alternative statistical criteria for model order selection. |
| spellingShingle | Mitsis, G Jbabdi, S Bayesian model order selection for nonlinear system function expansions. |
| title | Bayesian model order selection for nonlinear system function expansions. |
| title_full | Bayesian model order selection for nonlinear system function expansions. |
| title_fullStr | Bayesian model order selection for nonlinear system function expansions. |
| title_full_unstemmed | Bayesian model order selection for nonlinear system function expansions. |
| title_short | Bayesian model order selection for nonlinear system function expansions. |
| title_sort | bayesian model order selection for nonlinear system function expansions |
| work_keys_str_mv | AT mitsisg bayesianmodelorderselectionfornonlinearsystemfunctionexpansions AT jbabdis bayesianmodelorderselectionfornonlinearsystemfunctionexpansions |