Results 21 to 30 of about 594 (117)

CONSISTENT ESTIMATION OF ZERO‐INFLATED COUNT MODELS [PDF]

Health Economics, 2012
ABSTRACTApplications of zero‐inflated count data models have proliferated in health economics. However, zero‐inflated Poisson or zero‐inflated negative binomial maximum likelihood estimators are not robust to misspecification. This article proposes Poisson quasi‐likelihood estimators as an alternative. These estimators are consistent in the presence of
Staub, Kevin E, Winkelmann, Rainer
openaire   +4 more sources

Estimation of Mediation Effect on Zero-Inflated Microbiome Mediators

Mathematics, 2023
The mediation analysis methodology of the cause-and-effect relationship through mediators has been increasingly popular over the past decades. The human microbiome can contribute to the pathogenesis of many complex diseases by mediating disease-leading ...
Dongyang Yang, Wei Xu
doaj   +1 more source

Comparing Zero-inflated Poisson, Zero-inflated Negative Binomial and Zero-inflated Geometric in Count Data with Excess Zero

Asian Journal of Probability and Statistics, 2019
Count data often violate the assumptions of a normal distribution due to the fact that they are bounded by their lowest value which is zero. The Poison distribution is sometimes suggested but when the assumption of equal mean and variance is violated due to over-dispersion and presence of zeros we tend to look in the direction of other models.
R. A. Ipinyomi, M. I. Adarabioyo
openaire   +2 more sources

Inflation Target and its Impact on Macroeconomy in the Zero Lower Bound Environment: the case of the Czech economy

Review of Economic Perspectives, 2016
This paper uses a stochastic simulation of a DSGE model of the Czech economy to study the macroeconomic consequences of inflation target setting when interest rates are constrained by the zero lower bound.
Hloušek Miroslav
doaj   +1 more source

BZINB Model-Based Pathway Analysis and Module Identification Facilitates Integration of Microbiome and Metabolome Data

Microorganisms, 2023
Integration of multi-omics data is a challenging but necessary step to advance our understanding of the biology underlying human health and disease processes.
Bridget M. Lin, Hunyong Cho, Chuwen Liu, Jeff Roach, Apoena Aguiar Ribeiro, Kimon Divaris, Di Wu   +6 more
doaj   +1 more source

Higgs inflation in the Palatini formulation with kinetic terms for the metric

The Open Journal of Astrophysics, 2019
We consider scalar field inflation in the Palatini formulation of general relativity. The covariant derivative of the metric is then non-zero. From the effective theory point of view it should couple to other fields.
Syksy Räsänen
doaj   +2 more sources

A Spatial-Filtering Zero-Inflated Approach to the Estimation of the Gravity Model of Trade

Econometrics, 2018
Nonlinear estimation of the gravity model with Poisson-type regression methods has become popular for modelling international trade flows, because it permits a better accounting for zero flows and extreme values in the distribution tail. Nevertheless, as
Rodolfo Metulini, Roberto Patuelli, Daniel A. Griffith   +2 more
doaj   +1 more source

Predictive performance of count regression models versus machine learning techniques: A comparative analysis using an automobile insurance claims frequency dataset.

PLoS ONE
Accurate forecasting of claim frequency in automobile insurance is essential for insurers to assess risks effectively and establish appropriate pricing policies.
Gadir Alomair
doaj   +1 more source

Eternal inflation and the quantum birth of cosmic structure

European Physical Journal C: Particles and Fields, 2017
We consider the eternal inflation scenario of the slow-roll/chaotic type with the additional element of an objective collapse of the wave function. The incorporation of this new agent to the traditional inflationary setting might represent a possible ...
Gabriel León
doaj   +1 more source

Identifying Differentially Expressed Genes of Zero Inflated Single Cell RNA Sequencing Data Using Mixed Model Score Tests

Frontiers in Genetics, 2021
Single cell RNA sequencing (scRNA-seq) allows quantitative measurement and comparison of gene expression at the resolution of single cells. Ignoring the batch effects and zero inflation of scRNA-seq data, many proposed differentially expressed (DE ...
Zhiqiang He, Yueyun Pan, Fang Shao, Hui Wang   +3 more
doaj   +1 more source