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arXiv 1606.08151math.STstat.TH
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截断圆参数估计量的改进方法

Methods for improving estimators of truncated circular parameters

Kanika, Somesh Kumar

摘要:

在欧几里得空间$\mathbb{R}^p$中参数的决策理论估计中,作用空间被选择为被估计量空间的凸闭包。本文将这一概念推广到具有圆、环面或圆柱支撑的分布的圆参数估计。由于方向分布具有曲线性质,因此现有的参数取值于$\mathbb{R}^p$的分布方法在此并不立即适用。圆是最简单的一维黎曼流形。我们使用凸性、投影等概念,流形上,以发展的充分条件的不容许估计的圆形参数。在估计问题中进一步引入了紧变换群下的不变性,并得到了等变估计的一个完全类定理。这推广了Moors [J. Amer. Statistist. Assoc.76(1981)910-915]上的$\mathbb{R}^p$到圆。研究结果是特别感兴趣的情况下,当一个圆形参数被截断。结果被实施到广泛的方向分布,以获得改进的圆形参数的估计。

英文摘要:

In decision theoretic estimation of parameters in Euclidean space $\mathbb{R}^p$, the action space is chosen to be the convex closure of the estimand space. In this paper, the concept has been extended to the estimation of circular parameters of distributions having support as a circle, torus or cylinder. As directional distributions are of curved nature, existing methods for distributions with parameters taking values in $\mathbb{R}^p$ are not immediately applicable here. A circle is the simplest one-dimensional Riemannian manifold. We employ concepts of convexity, projection, etc., on manifolds to develop sufficient conditions for inadmissibility of estimators for circular parameters. Further invariance under a compact group of transformations is introduced in the estimation problem and a complete class theorem for equivariant estimators is derived. This extends the results of Moors [J. Amer. Statist. Assoc. 76 (1981) 910-915] on $\mathbb{R}^p$ to circles. The findings are of special interest to the case when a circular parameter is truncated. The results are implemented to a wide range of directional distributions to obtain improved estimators of circular parameters.

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