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arXiv 1005.0983math.STstat.TH
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Fisher尺度信息

Fisher Information of Scale

Peter Ruckdeschel, Helmut Rieder

摘要:

受尺度M-估计的渐近方差的信息界的启发,我们定义了任意分布函数F在实数线上的尺度的Fisher信息作为合适的上确界.此外,我们通过比例因子强制等方差。尺度的Fisher信息是弱下连续凸的。它是有限的当且仅当通常关于密度的假设成立,在此假设下经典地定义了尺度的Fisher信息,然后经典的和我们的概念都一致。有限尺度的Fisher信息也分别等价于F导出的尺度模型的L2-可微性和局部渐近正态性。

英文摘要:

Motivated by the information bound for the asymptotic variance of M-estimates for scale, we define Fisher information of scale of any distribution function F on the real line as a suitable supremum. In addition, we enforce equivariance by a scale factor. Fisher information of scale is weakly lower semicontinuous and convex. It is finite iff the usual assumptions on densities hold, under which Fisher information of scale is classically defined, and then both classical and our notions agree. Fisher information of scale finite is also equivalent to L_2-differentiability and local asymptotic normality, respectively, of the scale model induced by F.

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