Results 21 to 30 of about 1,180 (135)
Bootstraping financial time series [PDF]
, 2002 It is well known that time series of returns are characterized by volatility clustering and excess kurtosis. Therefore, when modelling the dynamic behavior of returns, inference and prediction methods, based on independent and/or Gaussian observations ...
Pascual, Lorenzo +4 more
core +1 more source
Uncertainty Quantification for Cardiac Diffusion Tensor Imaging Without Additional Datasets
Magnetic Resonance in Medicine, Volume 96, Issue 3, Page 1458-1463, September 2026.ABSTRACT Purpose Cardiac diffusion tensor imaging (cDTI) is subject to physiological noise, thermal noise, and signal corruption, which cause errors in diffusion measures. While a larger dataset can be decimated to investigate the general precision of measures from fitting smaller datasets, uncertainty quantification (UQ) methods for fitting entire ...
Sam Coveney +7 more
wiley +1 more source
A jackknife variance estimator for self-weighted two-stage samples
, 2013 Self-weighted two-stage sampling designs are popular in practice as they simplify field-work. It is common in practice to compute variance estimates only from the first sampling stage, neglecting the second stage.
Escobar, E.L., Berger, Y.G.
core +1 more source
Cladistics, Volume 42, Issue 4, Page 401-412, August 2026.Abstract Historical biogeography faces a persistent conceptual and methodological dilemma concerning the nature of its central analytical units. Using the recent proposal by Schultz and Cracraft (Cladistics 40, 653) as a catalyst, this article critiques the argument that causal inference necessitates the replacement of areas of endemism with barriers ...
Augusto Ferrari
wiley +1 more source
Global Population Structure and Dynamics of Wheat Powdery Mildew
Molecular Ecology, Volume 35, Issue 15, August 2026.ABSTRACT The global movement of pests and pathogens can often be traced to human migratory activities that include the movement of agricultural crops. The causal agent of wheat powdery mildew, the ascomycete fungus Blumeria graminis f. sp. tritici (B. graminis f. sp.
Tim Kloppe +3 more
wiley +1 more source
The Surprising Bias of PPML Estimates of Structural Gravity Models With Two‐Way Fixed Effects
Review of International Economics, Volume 34, Issue 3, Page 615-631, August 2026.ABSTRACT The previous literature has shown that the Poisson Pseudo‐Maximum Likelihood (PPML) estimator provides consistent and asymptotically unbiased estimates of the parameters of structural gravity models with two‐way fixed effects, although their standard errors need correction.
Ben Shepherd, Tom Zylkin
wiley +1 more source
Paleosecular Variation Constraints on Geomagnetic Field Morphology at ca. 1100 Ma
Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.Abstract Paleosecular variation provides a statistical test of long‐term geomagnetic field morphology, but its behavior across Precambrian polarity regimes remains poorly constrained. We compile a virtual geomagnetic pole dispersion data set spanning 1130–1070 Ma and apply nonlinear Model G fitting to evaluate field structure across the interval ...
Hanqing Zhao +7 more
wiley +1 more source
A Nonparametric Method for the Derivation of α/β Ratios from the Effect of Fractionated Irradiations [PDF]
, 1991 Multifractionation isoeffect data are commonly analysed under the assumption that cell survival determines the observed tissue or tumour response, and that it follows a linear-quadratic dose dependence.
Guttenberger, R. +5 more
core +1 more source
Advanced Optical Materials, Volume 14, Issue 25, 3 July 2026.Negatively charged boron vacancy defects in hexagonal boron nitride promise near‐surface quantum sensing, but their internal spin transition rates are only partly understood. This work directly measures the defect's singlet‐state lifetime, 15(3) ns, using a nanosecond rise‐time dual‐pulse photoluminescence‐recovery method, and shows that high laser ...
Richard A. Escalante +11 more
wiley +1 more source
Genomic Variation and Population Structure of Portuguese Native Dog Breeds
Animal Genetics, Volume 57, Issue 3, June 2026.ABSTRACT The presence of dogs in Portugal is confirmed by zooarchaeological evidence dating to at least 7600 years ago. The 11 native dog breeds that exist in this territory are therefore the end‐product of a complex evolutionary process. This study characterises the genomic diversity and population structure of 10 native breeds based on whole‐genome ...
Ludmilla Blaschikoff +4 more
wiley +1 more source