The Annals of Statistics

Sieve estimation of constant and time-varying coefficients in nonlinear ordinary differential equation models by considering both numerical error and measurement error

Hongqi Xue, Hongyu Miao, and Hulin Wu

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Abstract

This article considers estimation of constant and time-varying coefficients in nonlinear ordinary differential equation (ODE) models where analytic closed-form solutions are not available. The numerical solution-based nonlinear least squares (NLS) estimator is investigated in this study. A numerical algorithm such as the Runge–Kutta method is used to approximate the ODE solution. The asymptotic properties are established for the proposed estimators considering both numerical error and measurement error. The B-spline is used to approximate the time-varying coefficients, and the corresponding asymptotic theories in this case are investigated under the framework of the sieve approach. Our results show that if the maximum step size of the p-order numerical algorithm goes to zero at a rate faster than n−1/(p∧4), the numerical error is negligible compared to the measurement error. This result provides a theoretical guidance in selection of the step size for numerical evaluations of ODEs. Moreover, we have shown that the numerical solution-based NLS estimator and the sieve NLS estimator are strongly consistent. The sieve estimator of constant parameters is asymptotically normal with the same asymptotic co-variance as that of the case where the true ODE solution is exactly known, while the estimator of the time-varying parameter has the optimal convergence rate under some regularity conditions. The theoretical results are also developed for the case when the step size of the ODE numerical solver does not go to zero fast enough or the numerical error is comparable to the measurement error. We illustrate our approach with both simulation studies and clinical data on HIV viral dynamics.

Article information

Source
Ann. Statist. Volume 38, Number 4 (2010), 2351-2387.

Dates
First available in Project Euclid: 11 July 2010

Permanent link to this document
http://projecteuclid.org/euclid.aos/1278861251

Digital Object Identifier
doi:10.1214/09-AOS784

Mathematical Reviews number (MathSciNet)
MR2676892

Zentralblatt MATH identifier
05774407

Subjects
Primary: 60G02 60G20: Generalized stochastic processes
Secondary: 60G08 62P10: Applications to biology and medical sciences

Keywords
Nonlinear least squares ordinary differential equation Runge–Kutta algorithm sieve approach spline smoothing time-varying parameter

Citation

Xue, Hongqi; Miao, Hongyu; Wu, Hulin. Sieve estimation of constant and time-varying coefficients in nonlinear ordinary differential equation models by considering both numerical error and measurement error. Ann. Statist. 38 (2010), no. 4, 2351--2387. doi:10.1214/09-AOS784. http://projecteuclid.org/euclid.aos/1278861251.


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