Estimating discontinuous periodic signals in a time inhomogeneous diffusion
Estimating discontinuous periodic signals in a time inhomogeneous diffusion
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估计时间不均匀扩散中的不连续周期信号
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发表时间:
2009
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通讯作者:
Yury Kutoyants
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作者:
Reinhard Höpfner;Yury Kutoyants
We consider a diffusion $${(xi_t)_{tgeq 0}}$$ with some T-periodic time dependent input term contained in the drift: under an unknown parameter $${varthetainvarTheta}$$ , some discontinuity—an additional periodic signal—occurs at times $${kT,{+},vartheta}$$ , $${k in I!!N}$$ . Assuming positive Harris recurrence of $${(xi_{kT})_{k in I!!N _0}}$$ and exploiting the periodicity structure, we prove limit theorems for certain martingales and functionals of the process $${(xi_t)_{tge 0}}$$ . They allow to consider the statistical model parametrized by $${varthetainvarTheta}$$ locally in small neighbourhoods of some fixed $${vartheta}$$, with radius $${frac{1}{n}}$$ as n → ∞. We prove convergence of local models to a limit experiment studied by Ibragimov and Khasminskii (Statistical estimation, 1981) and discuss the behaviour of estimators under contiguous alternatives.