Asymptotic theory of semiparametric Z-estimators for stochastic processes with applications to ergodic diffusions and time series
随机过程半参数Z估计量的渐近理论:遍历扩散与时间序列应用AI 解读 ↓
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随机过程半参数Z估计量的渐近理论:遍历扩散与时间序列应用AI 解读 ↓
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This paper generalizes a part of the theory of Z-estimation which has been developed mainly in the context of modern empirical processes to the case of stochastic processes, typically, semimartingales. We present a general theorem to derive the asymptotic behavior of the solution to an estimating equation θ↝Ψn(θ, ĥn)=0 with an abstract nuisance parameter h when the compensator of Ψn is random. As its application, we consider the estimation problem in an ergodic diffusion process model where the drift coefficient contains an unknown, finite-dimensional parameter θ and the diffusion coefficient is indexed by a nuisance parameter h from an infinite-dimensional space. An example for the nuisance parameter space is a class of smooth functions. We establish the asymptotic normality and efficiency of a Z-estimator for the drift coefficient. As another application, we present a similar result also in an ergodic time series model.