Abstract
A biomechanical model often requires parameter estimation and selection in a known but complicated nonlinear function. Motivated by observing that the data from a head-neck position tracking system, one of biomechanical models, show multiplicative time-dependent errors, we develop a modified penalized weighted least squares estimator. The proposed method can be also applied to a model with possible non-zero mean time-dependent additive errors. Asymptotic properties of the proposed estimator are investigated under mild conditions on a weight matrix and the error process. A simulation study demonstrates that the proposed estimation works well in both parameter estimation and selection with time-dependent error. The analysis and comparison with an existing method for head-neck position tracking data show better performance of the proposed method in terms of the variance accounted for.
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Acknowledgements
Wu was supported by Ministry of Science and Technology of Taiwan under grants (MOST 111-2118-M-259 -002). The work of Lim was supported by National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT) (NRF-2019R1A2C1002213 and 2020R1A4A1018207). The work of Yoon and Choi was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (MSIT) (Nos. RS-2023-00221762 and 2021R1A2B5B01002620).
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You, H., Yoon, K., Wu, WY. et al. Regularized nonlinear regression with dependent errors and its application to a biomechanical model. Ann Inst Stat Math 76, 481–510 (2024). https://doi.org/10.1007/s10463-023-00895-1
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DOI: https://doi.org/10.1007/s10463-023-00895-1