Results 61 to 70 of about 40,682 (295)

Genetic and morphometric differences between yellowtail snapper (Ocyurus chrysurus, Lutjanidae) populations of the tropical West Atlantic

Genetics and Molecular Biology, 2008
Populations of Ocyurus chrysurus were compared genetically and morphometrically along the West Atlantic coast to test the null hypothesis of population homogeneity in the area.
Anderson V. Vasconcellos, Paulo Vianna, Paulo C. Paiva, Renata Schama, Antonio Solé-Cava   +4 more
doaj   +1 more source

Coupling Control Variates for Markov Chain Monte Carlo

, 2008
We show that Markov couplings can be used to improve the accuracy of Markov chain Monte Carlo calculations in some situations where the steady-state probability distribution is not explicitly known.
Anderson, Bertini, de Groot, Derrida, Gillespie, Glynn, Glynn, Hammersley, Henderson, Izaguirre, Jonathan B. Goodman, Kalos, Kevin K. Lin, Kipnis, Le Jan, Liggett, Lin, Lindvall, Propp, Sharon, Sokal, Spohn, Wong   +22 more
core   +1 more source

NRASQ61R Expression in Lymphatic Endothelial Cells Causes Enlarged Vessels, Hemorrhagic Chylous Effusions, and High Mortality in a Mouse Model of Kaposiform Lymphangiomatosis

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Kaposiform lymphangiomatosis (KLA) is an aggressive complex lymphatic anomaly. Patients exhibit malformed lymphatic vessels and often develop hemorrhagic effusions and elevated angiopoietin‐2 (Ang‐2) levels. A somatic NRAS p.Q61R (NRASQ61R) mutation has been associated with KLA.
C. Griffin McDaniel, Patricia Pastura, Joshua P. Scallan, Timothy D. Le Cras   +3 more
wiley   +1 more source

ORTHOGONAL PERMUTATION SAMPLING FOR SHAPLEY VALUES: UNBIASED STRATIFIED ESTIMATORS WITH VARIANCE GUARANTEES

Journal of Intelligent Systems and Applied Data Science
Shapley values for feature attribution suffer from high variance requiring thousands of model evaluations. We introduce Orthogonal Permutation Sampling (OPS), achieving provable variance reduction through: (i) exact position stratification, (ii ...
YASH VARSHNEY, RANAV TYAGI, ANURAG SINHA
doaj   +1 more source

Bi-directional prospective associations between objectively measured physical activity and fundamental motor skills in children: a two-year follow-up

International Journal of Behavioral Nutrition and Physical Activity, 2020
Background The direction of the longitudinal relationship between physical activity (PA) and fundamental motor skills (FMS) remains unclear. We evaluated the bi-directional, prospective relationships between intensity-specific physical activity (PA) and ...
Ada Kristine Ofrim Nilsen, Sigmund Alfred Anderssen, Kjersti Johannessen, Katrine Nyvoll Aadland, Einar Ylvisaaker, Jan Morten Loftesnes, Eivind Aadland   +6 more
doaj   +1 more source

Variance reduction for discretised diffusions via regression

, 2017
In this paper we present a novel approach towards variance reduction for discretised diffusion processes. The proposed approach involves specially constructed control variates and allows for a significant reduction in the variance for the terminal ...
Belomestny, Denis, Häfner, Stefan, Nagapetyan, Tigran, Urusov, Mikhail   +3 more
core   +1 more source

Pulmonary Dysfunction Is Associated With Sleep Study Abnormalities in Children With Sickle Cell Disease: A Multicenter Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction Pulmonary dysfunction and sleep abnormalities are common in children with sickle cell disease (SCD) and are associated with worse clinical outcomes. Whether spirometry abnormalities are associated with polysomnography (PSG) findings remains unclear.
Ammar Saadoon Alishlash, Anis Rabbani Nourani, A. K. M. Fazlur Rahman, Dima Ezmigna, Tarig Ali‐Dinar   +4 more
wiley   +1 more source

Black Box Variational Inference [PDF]

, 2013
Variational inference has become a widely used method to approximate posteriors in complex latent variables models. However, deriving a variational inference algorithm generally requires significant model-specific analysis, and these efforts can hinder ...
Blei, David M., Gerrish, Sean, Ranganath, Rajesh   +2 more
core   +2 more sources

‘They Need to Hear You Say It’: Healthcare Professionals’ Perspectives on Barriers and Enablers to End‐of‐Life Discussions With Adolescents and Young Adults With Cancer

Pediatric Blood &Cancer, EarlyView.
ABSTRACT End‐of‐life conversations with adolescents and young adults (AYAs) with cancer rarely occur without the guidance of healthcare professionals. As a part of the ‘Difficult Discussions’ study, focused on palliative care and advance care planning discussions with AYAs with cancer, we investigated the factors that healthcare professionals identify ...
Justine Lee, Holly Evans, Claire E. Wakefield, Antoinette Anazodo, Richard J. Cohn, Brittany C. McGill, Elizabeth A. Lobb, Lori Wiener, Madeleine L. Juhrmann, Ursula M. Sansom‐Daly   +9 more
wiley   +1 more source

High-precision Galaxy Clustering Predictions from Small-volume Hydrodynamical Simulations via Control Variates

The Astrophysical Journal
Cosmological simulations of galaxy formation are an invaluable tool for understanding galaxy formation and its impact on cosmological parameter inference from large-scale structures.
Alexandra Doytcheva, Filomela V. Gerou, Johannes U. Lange   +2 more
doaj   +1 more source