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arXiv 1407.0249math.STstat.TH
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空间点过程强度估计的变分方法

Variational approach for spatial point process intensity estimation

Jean-François Coeurjolly, Jesper Møller

摘要:

我们引入了一个新的变分估计的强度函数的非齐次空间点过程的点在$d$维欧几里得空间和观察到的有界区域。当强度函数被假设为对数线性型$β+{θ}^{\top}z(u)$时,变分估计器适用于简单和一般的设置,其中$z$是空间协变量函数,并且重点是估计${θ}$ .变分估计是非常简单的实现和快速比其他估计程序。我们建立了它的强相合性和渐近正态性。我们还讨论了它的有限样本性质的最大一阶复合似然估计相比,考虑各种非齐次空间点过程模型和尺寸以及设置时,$z$是完全或仅部分已知。

英文摘要:

We introduce a new variational estimator for the intensity function of an inhomogeneous spatial point process with points in the $d$-dimensional Euclidean space and observed within a bounded region. The variational estimator applies in a simple and general setting when the intensity function is assumed to be of log-linear form $β+{θ}^{\top}z(u)$ where $z$ is a spatial covariate function and the focus is on estimating ${θ}$. The variational estimator is very simple to implement and quicker than alternative estimation procedures. We establish its strong consistency and asymptotic normality. We also discuss its finite-sample properties in comparison with the maximum first order composite likelihood estimator when considering various inhomogeneous spatial point process models and dimensions as well as settings were $z$ is completely or only partially known.

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