Abstract
The parameter estimation methods for the nonlinear exponential autoregressive (ExpAR) model are investigated in this work. Combining the hierarchical identification principle with the negative gradient search, we derive a hierarchical stochastic gradient algorithm. Inspired by the multi-innovation identification theory, we develop a hierarchical-based multi-innovation identification algorithm for the ExpAR model. Introducing two forgetting factors, a variant of the hierarchical-based multi-innovation identification algorithm is proposed. Moreover, to compare and demonstrate the serviceability of these algorithms, a nonlinear ExpAR process is taken as an example in the simulation.
Original language | English |
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Pages (from-to) | 2079-2092 |
Number of pages | 14 |
Journal | Nonlinear Dynamics |
Volume | 95 |
Issue number | 3 |
Early online date | 6 Dec 2018 |
DOIs | |
Publication status | Published - 28 Feb 2019 |
Funding
Acknowledgements This work was supported by the 111 Project (B12018), the National Natural Science Foundation of China (No. 61273194) and the National First-Class Discipline Program of Light Industry Technology and Engineering (LITE2018-26).
Keywords
- hierarchical identification
- multi-innovation identification
- negative gradient search
- nonlinear ExpAR model
- parameter estimation