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Estimation of fractal dimension for a class of Non-Gaussian stationary processes and fields | Grace Chan
; Andrew T. A. Wood
; | Date: |
25 Jun 2004 | Journal: | Annals of Statistics 2004, Vol. 32, No. 3, 1222-1260 DOI: 10.1214/009053604000000346 | Subject: | Statistics MSC-class: 62M99 (Primary) 62E20 (Secondary) | math.ST | Abstract: | We present the asymptotic distribution theory for a class of increment-based estimators of the fractal dimension of a random field of the form g{X(t)}, where g:R o R is an unknown smooth function and X(t) is a real-valued stationary Gaussian field on R^d, d=1 or 2, whose covariance function obeys a power law at the origin. The relevant theoretical framework here is ``fixed domain’’ (or ``infill’’) asymptotics. Surprisingly, the limit theory in this non-Gaussian case is somewhat richer than in the Gaussian case (the latter is recovered when g is affine), in part because estimators of the type considered may have an asymptotic variance which is random in the limit. Broadly, when g is smooth and nonaffine, three types of limit distributions can arise, types (i), (ii) and (iii), say. Each type can be represented as a random integral. More specifically, type (i) can be represented as the integral of a certain random function with respect to Lebesgue measure; type (ii) can be represented as the integral of a second random function | Source: | arXiv, math.ST/0406525 | Services: | Forum | Review | PDF | Favorites |
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