منابع مشابه
The Rao-blackwell Theorem in Stereology and Some Counterexamples
A version of the Rao-Blackwell theorem is shown to apply to most, but not all, stereological sampling designs. Estimators based on random test grids typically have larger variance than quadrat estimators; random s-dimensional samples are worse than random r-dimensional samples for s < r. Furthermore, the standard stereological ratio estimators of diierent dimensions are canonically related to e...
متن کاملCmb Likelihood Approximation by a Gaussianized Blackwell-rao Estimator
We introduce a new CMB temperature likelihood approximation called the Gaussianized BlackwellRao (GBR) estimator. This estimator is derived by transforming the observed marginal power spectrum distributions obtained by the CMB Gibbs sampler into standard univariate Gaussians, and then approximate their joint transformed distribution by a multivariate Gaussian. The method is exact for full-sky c...
متن کاملLog-Optimal Portfolio Selection Using the Blackwell Approachability Theorem
We present a method for constructing the log-optimal portfolio using the well-calibrated forecasts of market values. Dawid’s notion of calibration and the Blackwell approachability theorem are used for computing well-calibrated forecasts. We select a portfolio using this “artificial” probability distribution of market values. Our portfolio performs asymptotically at least as well as any station...
متن کاملA Reformulation of the Arora-Rao-Vazirani Structure Theorem
In a well-known paper[5], Arora, Rao and Vazirani obtained an O( √ log n) approximation to the Balanced Separator problem and Uniform Sparsest Cut. At the heart of their result is a geometric statement about sets of points that satisfy triangle inequalities, which also underlies subsequent work on approximation algorithms and geometric embeddings. In this note, we give an equivalent formulation...
متن کاملA composition theorem for generalized Bhaskar Rao designs
Let H be a normal subgroup of a finite group G. We show that: If a GBRD(v, k, A.; G IH) exists and a GBRD(k,j, JA.; H) exists then a GBRD(v,j, AJA.; G) exists. We apply this result to show that: i) If k does not exceed the least prime factor of IG I, then a GBRD(k, k, A; G) exists for all A EO (mod IG I); ii) If G is of order IG Ie lor 5 (mod 6) then a GBRD(v, 3, A = t IG I; G), v>3, exists if ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Scholarpedia
سال: 2008
ISSN: 1941-6016
DOI: 10.4249/scholarpedia.7039