Results 131 to 140 of about 479,757 (331)
A bayesian approach to shrinkage estimators [PDF]
, 2017 Estimators obtained by shrinking the least squares estimator are becoming widely used since the work of Stein, in the early 60’s, where it was presented an estimator for the mean of multivariate normal that dominates the sample mean, and the work of ...
Souza, Devanil Jaques de +3 more
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Risk Analysis and Robustness of four Shrinkage Estimators
, 1996 In this paper we first investigate the risk properties of four shrinkage estimators of a location vector assuming that the random vector follows a multivariate normal distribution.
Ching-Hui Chano, Nabendu Pal
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Small-area estimation with spatial similarity [PDF]
A class of composite estimators of small area quantities that exploit spatial (distancerelated) similarity is derived. It is based on a distribution-free model for the areas, but the estimators are aimed to have optimal design-based properties ...
Nicholas Longford
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Conformal Metallosaccharide Hybrid Films for Protecting Wood Surfaces From Environmental Damage
Advanced Functional Materials, EarlyView.Ti‐ribose hybrid films fabricated by molecular layer deposition form a conformal and uniform coating on wood surfaces, which provides water repellence, dimensional stability, and resistance to acidic and alkaline environments, while preserving the natural appearance.
Wenwen Wang +7 more
wiley +1 more source
Advanced Functional Materials, EarlyView.A high‐Zn2+‐transference hydrogel electrolyte of ex‐PDADAM is developed via anion exchange at quaternary ammonium sites, achieving high Zn2+ transference number (0.86), ionic conductivity (8.10 mS cm−1), and toughness (51.25 MJ m−3). Symmetric cells are operated stably for over 2000 h, while flexible pouch cells retain 90.9% capacity after 300 cycles ...
Jung Woo Hong +8 more
wiley +1 more source
Shrinking the Variance-Covariance Matrix: Simpler is Better
Lahore Journal of EconomicsThis study focuses on the estimation of the covariance matrix as an input to portfolio optimization. We compare 12 covariance estimators across four categories – conventional methods, factor models, portfolios of estimators and the shrinkage approach ...
Muhammad Husnain +2 more
doaj
Interface Effects in Ultrathin Silicon on Insulator Films
Advanced Functional Materials, EarlyView.This work establishes a systematic framework to discriminate how bulk and interface phenomena affect charge transport in ultrathin P‐doped silicon‐on‐insulator (SOI) films. For Si films below 15 nm, electrical characterization demonstrates that interface states drive charge transport, shifting the metal‐insulator transition (MIT) critical dopant ...
Andrea Pulici +8 more
wiley +1 more source
A study on a class of shrinkage estimators
, 2012 Yığına ilişkin istatistiksel bir çıkarım yapabilmek için öncelikle bu yığının parametreleri belirlenmeye çalışılır. Bu amaç doğrultusunda sapmasız tahmin ediciler yaygın olarak kullanılır.
Özdemir, Şenay
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Advanced Functional Materials, EarlyView.Ferroelectric domain variants that are energetically equivalent are expected to remain preserved during polarization reversal. However, phase‐field simulations reveal that inclined domain walls in relaxor ferroelectrics can undergo irreversible elimination during alternating current poling through a proximity effect driven by long‐range elastic ...
Yuan‐Jie Sun +2 more
wiley +1 more source
Minimaxity and admissibility of matrix shrinkage estimators
, 2006 This master thesis refers to the determination of certain choice criteria for minimaxes and admissibles shrinkage estimators. Adopting the coordinate-free approach, the problem of estimating the mean of a multidimensional normal distribution over a n ...
Φραγκοπούλου, Βασιλική
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