Results 51 to 60 of about 42,989 (212)

A q-rious positivity

, 2010
The $q$-binomial coefficients $\qbinom{n}{m}=\prod_{i=1}^m(1-q^{n-m+i})/(1-q^i)$, for integers $0\le m\le n$, are known to be polynomials with non-negative integer coefficients.
Warnaar, S. Ole, Zudilin, Wadim
core   +1 more source

Location–scale models in ecology and evolution: Heteroscedasticity in continuous, count and proportion data

Methods in Ecology and Evolution, EarlyView.
Abstract Biological data often violate the assumption of constant variance, yet such heteroscedasticity can reflect meaningful biological processes such as plasticity, canalization or stress responses. Despite this, most models treat variance as statistical noise. Here, we reintroduce location–scale regression as a general framework that jointly models
Shinichi Nakagawa, Santiago Ortega, Elena Gazzea, Malgorzata Lagisz, Anna Lenz, Erick Lundgren, Ayumi Mizuno   +6 more
wiley   +1 more source

Supercongruences for sporadic sequences [PDF]

, 2014
We prove two-term supercongruences for generalizations of recently discovered sporadic sequences of Cooper. We also discuss recent progress and future directions concerning other types of supercongruences.Comment: 16 pages, to appear in Proceedings of ...
Osburn, Robert, Sahu, Brundaban, Straub, Armin   +2 more
core   +1 more source

Secondary analysis of a combined harm‐reduction treatment and extended‐release naltrexone randomized clinical trial for alcohol use disorder: Differences across race, ethnicity and sex assigned at birth

Addiction, EarlyView.
Abstract Background and Aims In a prior randomized clinical trial (RCT), combined pharmacobehavioral harm‐reduction treatment improved alcohol outcomes and physical health‐related quality of life (PH‐QoL). In this secondary analysis, we tested race, ethnicity and sex assigned at birth as predictors and moderators of these effects.
Silvi C. Goldstein, Nicole H. Weiss, Manshu Yang, Sarah W. Feldstein Ewing, Susan E. Collins   +4 more
wiley   +1 more source

Estimation of Daily Smoking Prevalence for Disaggregated Statistical Areas in Australia

Australian &New Zealand Journal of Statistics, EarlyView.
ABSTRACT Motivated by the need to estimate prevalence at multiple disaggregated level hierarchies, rather than only one, this study extends widely used area‐level models in Bayesian and frequentist framework. We propose adding additional unstructured random effects at higher level disaggregated domains to the traditional models. Using our extension, we
Sumonkanti Das, Bernard Baffour, Alice Richardson, Susanna M. Cramb, Stephen John Haslett   +4 more
wiley   +1 more source

Internal Limiting Membrane Flap Versus Conventional Peeling for Idiopathic Full Thickness Macular Holes: A Registry Analysis of 2990 Eyes

Clinical &Experimental Ophthalmology, EarlyView.
ABSTRACT Background To compare the anatomical and functional outcomes of internal limiting membrane (ILM) flap and conventional ILM peeling in idiopathic full‐thickness macular holes (FTMHs). Methods Retrospective cohort study of all eyes treated with vitrectomy and ILM peeling (ILM‐P) with or without ILM flap (ILM‐F) for primary idiopathic FTMH repair
Zi Jin, Mohammad Amin Honardoost, Ee Lin Ong, Ahmad Reza Pourghaderi, Fred K. Chen, Weng Onn Chan, Prakshi Chopra, Mitchell Lee, Abhishek Sharma, Gurmit Uppal, Penelope J. Allen, Rohan W. Essex, Adrian T. Fung, Australian and New Zealand Society of Retinal Specialists Retinal Surgery Registry Group   +13 more
wiley   +1 more source

Closed‐Form Optimal Investment Under Generalized GARCH Models

European Financial Management, EarlyView.
ABSTRACT This paper introduces a new class of stochastic volatility models for asset prices, the generalized Heston Nandi GARCH (GHN‐GARCH), with the primary objective of optimal dynamic asset allocation under expected utility theory for constant relative risk aversion investors. We study some of its theoretical properties, and demonstrate that the GHN‐
Marcos Escobar‐Anel, Tobias Lausser, Rudi Zagst   +2 more
wiley   +1 more source

Life Cycle Consumption and Portfolio Choice Under Real Interest Rate Risk

Financial Management, EarlyView.
ABSTRACT We set up a life cycle model with real interest rate risk to demonstrate that real interest rates have implications for optimal household consumption and investments. Lower interest rates lead to higher optimal stock investments and lower consumption.
Marcel Fischer, Natascha Jankowski
wiley   +1 more source

Sex‐biased dispersal in the Arabian babbler (Argya squamiceps)

Ibis, EarlyView.
Sex‐biased dispersal plays a central role in shaping social structure and reproductive strategies in many bird species. In the Arabian Babbler Argya squamiceps, a cooperatively breeding species with pronounced male philopatry, dispersal occurs individually or in kin‐based same‐sex coalitions.
Roni Ostreiher, Roger Mundry, Aviad Heifetz   +2 more
wiley   +1 more source

Nonparametric checks for count data models: an application to demand for health care in Spain [PDF]

, 1997
This paper presents model specification checking procedures for count data regression models which are consistent in the direction of nonparametric alternatives.
Delgado, Miguel A., Álvarez, Begoña
core   +1 more source