Results 41 to 50 of about 483 (131)

InstaMap: instant‐NGP for cryo‐EM density maps

Acta Crystallographica Section D, Volume 81, Issue 4, Page 147-169, April 2025.
Cryo‐EM density‐map inference, with fixed pose and contrast transfer function, using a multi‐resolution hash‐encoding framework called instant‐NGP, is described, together with its extension to heterogeneity inference by bending space with a per‐image vector field.Despite the parallels between problems in computer vision and cryo‐electron microscopy ...
Geoffrey Woollard, Wenda Zhou, Erik H. Thiede, Chen Lin, Nikolaus Grigorieff, Pilar Cossio, Khanh Dao Duc, Sonya M. Hanson   +7 more
wiley   +1 more source

Saddlepoint Approximations in Statistics

The Annals of Mathematical Statistics, 1954
It is often required to approximate to the distribution of some statistic whose exact distribution cannot be conveniently obtained. When the first few moments are known, a common procedure is to fit a law of the Pearson or Edgeworth type having the same moments as far as they are given.
openaire   +2 more sources

On the Validity of Edgeworth and Saddlepoint Approximations

Journal of Multivariate Analysis, 1994
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Booth, J.G., Hall, P., Wood, A.T.A.
openaire   +1 more source

On some energy‐based variational principles in non‐dissipative magneto‐mechanics using a vector potential approach

International Journal for Numerical Methods in Engineering, Volume 125, Issue 24, 30 December 2024.
Abstract This contribution covers the variational‐based modeling of non‐dissipative magneto‐mechanical systems using a vector potential approach and the thorough analysis and discussion of corresponding conforming finite element methods. Since the construction of divergence‐free finite element spaces explicitly enforcing the Coulomb gauge poses some ...
Philipp Gebhart, Thomas Wallmersperger
wiley   +1 more source

Accurate and efficient P-values for rank-based independence tests with clustered data using a saddlepoint approximation

Scientific Reports
Accurate statistical inference for clustered data—common in multi-center clinical trials and longitudinal studies—poses significant challenges due to within-cluster correlation. Rank-based tests like the logrank, Wilcoxon, and Datta-Satten are valued for
Haidy A. Newer
doaj   +1 more source

Simulating the full spin manifold of triplet‐pair states in a series of covalently linked TIPS‐pentacenes

Journal of Computational Chemistry, Volume 45, Issue 32, Page 2727-2738, December 15, 2024.
Singlet fission (SF) is a promising pathway to generate multiple charge carriers from a single photon. Possible applications reach from photovolatic cells to quantum computing. A key intermediate in the process is the singlet‐coupled triplet pair or multi‐excitonic (ME) state.
Timo Schulz, Christel M. Marian
wiley   +1 more source

Estimation and simulation in directional and statistical shape models [PDF]

, 2012
This thesis is concerned with problems in two related areas of statistical shape analysis in two dimensional landmarks data and directional statistics in various sample spaces.
Ganeiber, Asaad Mohammed
core  

Saddlepoint inference for rank-based k-sample tests in clustered survival trials

Scientific Reports
Statistical inference for cluster randomized trials often involves complex derived endpoints, such as biomarker ratios or cumulative products, which significantly complicate the application of standard asymptotic theory.
Haidy A. Newer
doaj   +1 more source

Threshold-Dependent Dominance in Tail Risk Approximation

Econometrics
Regulatory risk measurement under Basel III’s Fundamental Review of the Trading Book places Expected Shortfall (ES) at the center of market risk capital, yet the fourth-order Edgeworth expansion, still widely used for Value-at-Risk (VaR) and ES ...
Terence D. Agbeyegbe
doaj   +1 more source

Saddlepoint approximations for linear rank tests with left-truncated, right-censored, and cross-sectional data under randomized block design

Scientific Reports
Left-truncated data arise when events are only recorded if they occur after a pre-specified time point, while right censoring occurs when the exact event time is not fully observed.
Kholoud S. Kamal, Abd El-Raheem M. Abd El-Raheem, Mahmoud M. Ramadan   +2 more
doaj   +1 more source