Results 51 to 60 of about 94,299 (278)

Flexible methods for species distribution modeling with small samples

open access: yesEcography, EarlyView.
Species distribution models (SDMs) predict where species live or could potentially live and are a key resource for ecological research and conservation decision‐making. However, current SDM methods often perform poorly for rare or inadequately sampled species, which include most species on earth, as well as most of those of the greatest conservation ...
Brian S. Maitner   +4 more
wiley   +1 more source

Multi-Site Wind Farms Dependence Structure Using Vine Copulas: Impacts of Dataset Sizes and Employed Copulas

open access: yesIEEE Access
Using copulas in statistics evaluates the dependence between random variables. Copula modeling has significantly been used in many areas, especially in the search for multivariate distributions.
Amir Shahirinia   +4 more
doaj   +1 more source

METODE GARCH-VINE COPULA UNTUK ESTIMASI VALUE AT RISK (VaR) PADA PORTOFOLIO [PDF]

open access: yes, 2018
Pengukuran risiko merupakan hal yang sangat penting pada suatu portofolio. Salah satu alat ukur yang dapat digunakan untuk menghitung risiko pada portofolio adalah Value at Risk (VaR), yaitu estimasi kerugian terbesar yang akan diperoleh.
Pintari, Herida Okta, Subekti, Retno
core  

Uncertainty Quantification in Planning Aircraft Ground Movement Operations With Towbarless Robotic Tractors

open access: yesInternational Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT This article addresses the problem of quantifying the uncertainty in planning aircraft ground movement operations using towbarless robotic tractors taking into account the inherent uncertainties of the problem, specifically, the uncertainties in the weight of the aircraft and in the rolling resistance of the wheels of the main landing gear ...
Almudena Buelta   +2 more
wiley   +1 more source

Development of decomposition-based model using Copula-GARCH approach to simulate instantaneous peak discharge

open access: yesApplied Water Science, 2023
Estimation of instantaneous peak discharge is important in the design of hydraulic structures and reservoir management. In this study, a new approach called CEEMD-Copula-GARCH is presented for simulating instantaneous peak discharge in the Qale Shahrokh ...
Mohammad Nazeri Tahroudi   +1 more
doaj   +1 more source

Patient‐reported outcomes, postoperative pain and pain relief after day‐case surgery (POPPY): chronic post‐surgical pain prevalence and associations*

open access: yesAnaesthesia, EarlyView.
Summary Introduction Day‐case surgical activity is increasing in the UK yet there is a lack of data on the prevalence of chronic post‐surgical pain in this population. This study uses data from the POPPY study to estimate the prevalence of chronic post‐surgical pain after day‐case surgery, its relationship with quality of life and also explores ...
Adam B. Brayne   +2037 more
wiley   +1 more source

Alternative Approaches for Estimating Highest‐Density Regions

open access: yesInternational Statistical Review, EarlyView.
Summary Among the variety of statistical intervals, highest‐density regions (HDRs) stand out for their ability to effectively summarise a distribution or sample, unveiling its distinctive and salient features. An HDR represents the minimum size set that satisfies a certain probability coverage, and current methods for their computation require ...
Nina Deliu, Brunero Liseo
wiley   +1 more source

D-vine copula based quantile regression [PDF]

open access: yesComputational Statistics & Data Analysis, 2017
Quantile regression, that is the prediction of conditional quantiles, has steadily gained importance in statistical modeling and financial applications. The authors introduce a new semiparametric quantile regression method based on sequentially fitting a likelihood optimal D-vine copula to given data resulting in highly flexible models with easily ...
Daniel Kraus, Claudia Czado
openaire   +3 more sources

Return Period of Nonconcurrent Climate Compound Events: A Nonparametric Bivariate Generalized Pareto Approach

open access: yesEnvironmetrics, Volume 37, Issue 1, January 2026.
ABSTRACT Compound events (CEs), commonly defined as the “combination of multiple drivers and/or hazards that contributes to societal or environmental risk”, often result in amplified impacts compared to individual hazards. In order to estimate the return period of bivariate CEs, a novel nonparametric approach employing bivariate Generalized Pareto ...
Grégoire Jacquemin   +3 more
wiley   +1 more source

Joint Probability Distribution of Wind–Wave Actions Based on Vine Copula Function

open access: yesJournal of Marine Science and Engineering
During its service life, a deep-sea floating structure is likely to encounter extreme marine disasters. The combined action of wind and wave loads poses a threat to its structural safety.
Yongtuo Wu   +3 more
doaj   +1 more source

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