Results 31 to 40 of about 4,430,595 (297)

Using observation-level random effects to model overdispersion in count data in ecology and evolution [PDF]

open access: yes, 2014
Overdispersion is common in models of count data in ecology and evolutionary biology, and can occur due to missing covariates, non-independent (aggregated) data, or an excess frequency of zeroes (zero-inflation).
Harrison, XA
core   +2 more sources

Regional Business Confidence as Early Indicator of Regional Economic Growth

open access: yesManaging Global Transitions, 2021
Official sub-national GDP figures in South Africa are usually published with long delays or not at all, i.e. relevant, reliable, and real-time economic data on a provincial and local (municipal) level are often non-existent, causing a significant data ...
Ewert Kleynhans, Clive Coetzee
doaj  

Effective aspects of Bernoulli randomness [PDF]

open access: yesJournal of Logic and Computation, 2019
AbstractIn this paper, we study Bernoulli random sequences, i.e. sequences that are Martin-Löf random with respect to a Bernoulli measure $\mu _p$ for some $p\in [0,1]$, where we allow for the possibility that $p$ is noncomputable. We focus in particular on the case in which the underlying Bernoulli parameter $p$ is proper (i.e.
openaire   +2 more sources

Modeling of informal employment factors

open access: yesВестник Северо-Кавказского федерального университета
Introduction. The problem of reducing the level of informal employment has worsened in the last 3 years against the background of geopolitical crises.
Yu. A. Metel, O. A. Lepekhin
doaj   +1 more source

Resonant effects in random dielectric structures [PDF]

open access: yes, 2013
Recently, a theory for artificial magnetism in two-dimensional photonic crystals has been developed for large wavelength using homogenization techniques.
Bouchitte, Guy   +2 more
core   +4 more sources

Reliability Modeling Method for Constant Stress Accelerated Degradation Based on the Generalized Wiener Process

open access: yesEntropy
This paper aims to improve the accuracy of reliability estimates and the failure time prediction for products exhibiting nonlinear degradation behavior under constant-stress accelerated degradation test (CSADT). To achieve this, a novel degradation model
Shanshan Li, Zaizai Yan, Junmei Jia
doaj   +1 more source

Linear Mixed Models with Marginally Symmetric Nonparametric Random Effects

open access: yes, 2016
Linear mixed models (LMMs) are used as an important tool in the data analysis of repeated measures and longitudinal studies. The most common form of LMMs utilize a normal distribution to model the random effects.
McLachlan, Geoffrey J., Nguyen, Hien D.
core   +1 more source

Multilevel Intersectional Analysis to Identify Extreme Profiles in Italian Student Achievement Data

open access: yesSocial Sciences
Students have diverse identities and social characteristics. The different combinations of these factors create a stratification that affects the learning outcomes.
Enrico Contin, Leonardo Grilli
doaj   +1 more source

Use of Repeated Measures Data Analysis for Field Trials with Annual and Perennial Crops

open access: yesPlants, 2022
Field studies conducted over time to collect any type of plant response to a set of treatments are often not treated as repeated measures data. The most used approaches for statistical analyses of this type of longitudinal data are based on separate ...
Paulo Pagliari   +3 more
doaj   +1 more source

Random Field and Random Anisotropy Effects in Defect-Free Three-Dimensional XY Models

open access: yes, 2000
Monte Carlo simulations have been used to study a vortex-free XY ferromagnet with a random field or a random anisotropy on simple cubic lattices. In the random field case, which can be related to a charge-density wave pinned by random point defects, it ...
A. Aharony   +37 more
core   +1 more source

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