Results 91 to 100 of about 1,170 (203)

An Inhomogeneous Weibull–Hawkes Process to Model Underdispersed Acoustic Cues

Journal of Agricultural, Biological and Environmental Statistics
Abstract A Hawkes point process describes self-exciting behaviour where event arrivals are triggered by historic events. These models are increasingly becoming a popular choice in analysing event-type data. Like all other inhomogeneous Poisson point processes, the waiting time between events in a Hawkes process is derived from an exponential ...
Alec B. M. Van Helsdingen, Tiago A. Marques, Charlotte M. Jones-Todd   +2 more
openaire   +4 more sources

Time‐Varying Dispersion Integer‐Valued GARCH Models

Journal of Time Series Analysis, Volume 47, Issue 4, Page 839-853, July 2026.
ABSTRACT We introduce a general class of INteger‐valued Generalized AutoRegressive Conditionally Heteroscedastic (INGARCH) processes by allowing simultaneously time‐varying mean and dispersion parameters. We call such models time‐varying dispersion INGARCH (tv‐DINGARCH) models.
Wagner Barreto‐Souza, Luiza S. C. Piancastelli, Konstantinos Fokianos, Hernando Ombao   +3 more
wiley   +1 more source

Modeling Latent Underdispersion with Discrete Order Statistics

The Poisson distribution is the default choice of likelihood for probabilistic models of count data. However, due to the equidispersion contraint of the Poisson, such models may have predictive uncertainty that is artificially inflated. While overdispersion has been extensively studied, conditional underdispersion -- where latent structure renders data
Lederman, Jimmy, Schein, Aaron
openaire   +2 more sources

Functional diversity in agricultural landscapes: evidence of long‐term clustering and multi‐scale effects of land use on avian communities

Oikos, Volume 2026, Issue 6, June 2026.
Functional diversity (FD) is an essential community property connecting biodiversity, ecosystem functioning, and conservation objectives. In agricultural landscapes, avian communities, which play key functional roles, are facing large‐scale biodiversity erosion, largely due to land‐use changes.
Pietro Tirozzi, Olivia Dondina, Valerio Orioli, Luciano Bani   +3 more
wiley   +1 more source

Community assembly of the ferns of Florida

, 2018
© 2018 The Authors. American Journal of Botany is published by Wiley Periodicals, Inc. on behalf of the Botanical Society of America. Premise of the Study: Many ecological and evolutionary processes shape the assembly of organisms into local communities ...
Burleigh, J. Gordon, Trotta, Lauren, Chambers, Sally M., Endara, Lorena, Sally M. Chambers, Sessa, Emily B., Baiser, Benjamin, Lorena Endara, Li, Daijiang, J. Gordon Burleigh, Benjamin Baiser, Emily B. Sessa, Lauren Trotta, Daijiang Li   +13 more
core   +1 more source

Improved Efficiency in Generalized Poisson Hurdle Model Estimation Using Restricted and Shrinkage Methods

Journal of Mathematics
This paper investigates the use of shrinkage estimators in the generalized Poisson hurdle (GPH) model for count data analysis. The GPH model effectively handles data with both excess zeros and over- or underdispersion.
Hayder Hasan Rahmah Al-Gharrawi, Hossein Bevrani, Basim Shlaibah Msallam   +2 more
doaj   +1 more source

Rewilding beyond the wilderness: Beavers can restore stream biodiversity from urban to agricultural to natural landscapes

Journal of Applied Ecology, Volume 63, Issue 6, June 2026.
Our findings show that beaver‐engineering significantly enhances local biodiversity across aquatic and terrestrial ecosystems, even at sites with high land‐use intensity. Hence, beavers can effectively restore stream biodiversity across a range of urban to agricultural to natural ecosystems.
Valentin Moser, Silvan Minnig, Leonardo Capitani, Steffen Boch, Nina Cramer, Oriana Edman, Patrick Hofmann, Alex Hürbin, Martin K. Obrist, Christopher Robinson, Dominic Tinner, Luca Zehnder, Christof Angst, Francesco Pomati, Anita C. Risch   +14 more
wiley   +1 more source

Functional homogenization of terrestrial mammals outside protected areas in the Hengduan Mountains, China

Conservation Biology, Volume 40, Issue 3, June 2026.
Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li, Wenqiang Hu, Kenneth Otieno Onditi, Quan Li, Zhechang Hu, Ru Bai, Yang Liu, Hongjiao Wang, Xuelong Jiang   +8 more
wiley   +1 more source

Bayesian Inference for Zero-Modified Power Series Regression Models

Mathematics
Count data often exhibit discrepancies in the frequencies of zeros, which commonly occur across various application domains. These data may include excess zeros (zero inflation) or, less frequently, a scarcity of zeros (zero deflation).
Katiane S. Conceição, Marinho G. Andrade, Victor Hugo Lachos, Nalini Ravishanker   +3 more
doaj   +1 more source

Quantifying the analysis uncertainty for nowcasting application [PDF]

Geoscientific Model Development
This study proposes a method to quantify uncertainty represented by errors in very-high-resolution near-surface analysis, specifically for weather nowcasting applications.
Y. Zhu, Y. Zhu, A. Atencia, M. Dabernig, Y. Wang, Y. Wang   +5 more
doaj   +1 more source