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arXiv 0808.0853math.STmath.PRstat.APstat.TH
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离散观测扩散过程的散度检验统计量

Divergences Test Statistics for Discretely Observed Diffusion Processes

Alessandro De Gregorio, Stefano Iacus

摘要:

在本文中,我们建议使用$ϕ$ -分歧作为检验统计量,以验证简单的假设,一维参数扩散过程$\de X_t = b(X_t, θ)\de t + σ(X_t, θ)\de W_t$,从离散观测$\{X_{t_i}, i=0, ..., n\}$与$t_i = iΔ_n$,$i=0, 1, >..., n$,下的渐近计划$Δ_n\to0$,$nΔ_n\to\infty$和$nΔ_n^2\to 0$。$ϕ$ -分歧类是一个很广的类,它包括了Kullback-Leibler,Rényi,幂和$α$ -分歧等几个特殊的成员.我们基于$ϕ$ -分歧导出了检验统计量的渐近分布。根据$ϕ$的规律性,极限定律采取不同的形式。这些收敛性不同于独立同分布随机变量的经典结果。数值分析被用来显示小样本性质的检验统计量的估计水平和权力的测试。

英文摘要:

In this paper we propose the use of $ϕ$-divergences as test statistics to verify simple hypotheses about a one-dimensional parametric diffusion process $\de X_t = b(X_t, θ)\de t + σ(X_t, θ)\de W_t$, from discrete observations $\{X_{t_i}, i=0, ..., n\}$ with $t_i = iΔ_n$, $i=0, 1, >..., n$, under the asymptotic scheme $Δ_n\to0$, $nΔ_n\to\infty$ and $nΔ_n^2\to 0$. The class of $ϕ$-divergences is wide and includes several special members like Kullback-Leibler, Rényi, power and $α$-divergences. We derive the asymptotic distribution of the test statistics based on $ϕ$-divergences. The limiting law takes different forms depending on the regularity of $ϕ$. These convergence differ from the classical results for independent and identically distributed random variables. Numerical analysis is used to show the small sample properties of the test statistics in terms of estimated level and power of the test.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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