Results 31 to 40 of about 120 (106)

CONWAY-MAXWELL POISSON REGRESSION MODELING OF INFANT MORTALITY IN SOUTH SULAWESI

Media Statistika
Overdispersion is a common problem in count data that can lead to inaccurate parameter estimates in Poisson regression models. Quasi-Poisson and negative binomial regressions are often used to address overdispersion but have limitations, especially with ...
Oktaviana Oktaviana, Wahidah Sanusi, Aswi Aswi, Sukarna Sukarna, Serifat Adedamola Folorunso   +4 more
doaj   +1 more source

Evidence for positive population‐level responses but not individual performance of sycamore aphids under elevated CO2

Agricultural and Forest Entomology, EarlyView.
The abundance and density of three common sycamore aphids increased under elevated CO2, although this was only statistically significant for Drepanosiphum platanoidis. The number of nymphs produced by individual D. platanoidis alates isolated in clip cages was not significantly affected, suggesting that population level response was not driven by ...
Liam M. Crowley, Carolina Mayoral, Abigail Enston, Jessica Money, Jon P. Sadler, Jeremy Pritchard, Rob A. MacKenzie, Scott A. L. Hayward   +7 more
wiley   +1 more source

Generalised count distributions for modelling parity

Demographic Research, 2017
Background: Parametric count distributions customarily used in demography - the Poisson and negative binomial models - do not offer satisfactory descriptions of empirical distributions of completed cohort parity.
Bilal Barakat
doaj   +1 more source

Latent Poisson count models for action count data from technology‐enhanced assessments

British Journal of Mathematical and Statistical Psychology, EarlyView.
Abstract Recent advances in computerized assessments have enabled the use of innovative item formats (e.g., drag‐and‐drop, scenario‐based), necessitating a flexible model that can capture systematic influence of item types on action counts. In this study, we present a refinement scheme that can explicitly model common features of items and allows ...
Gregory Arbet, Hyeon‐Ah Kang
wiley   +1 more source

Assessing the effectiveness of the ZICOMP-Shewhart control chart for monitoring zero-inflated processes

Scientific Reports
The zero-inflated Conway-Maxwell Poisson (ZICOMP) distribution models count data with many zero observations. This distribution assumes that zero observations occur with probability $$\:p$$ , and the count of nonconformities in a product unit follows the
Aqsa Sattar, Muhammad Ali Raza, Laila A. AL-Essa, Hanen Louati, Mohammed M. A. Almazah, Arailym Zaitzhanova   +5 more
doaj   +1 more source

ReMoDe – Recursive modality detection in distributions of ordinal data

British Journal of Mathematical and Statistical Psychology, EarlyView.
Abstract The detection of the number of modes in distributions of ordinal data is relevant for applied researchers across disciplines, from uncovering polarization to detecting incidence groups in clinical symptom scales. Yet, established modality detection methods are either purely descriptive or not developed for ordinal data.
Madlen Hoffstadt, Lourens Waldorp, Javier Garcia‐Bernardo, Han van der Maas   +3 more
wiley   +1 more source

The role of viability selection in shaping short‐ and long‐term consequences of early‐life conditions: An experiment in the Alpine swift

Journal of Animal Ecology, Volume 95, Issue 8, Page 1401-1418, August 2026.
In an experimental brood‐size manipulation in Alpine swifts, smaller nestlings were selectively lost during growth, eliminating treatment differences in adult size, yet individuals from enlarged broods showed higher reproductive performance. Abstract Environmental conditions experienced early in life can shape growth, morphology and survival, and can ...
Bashar Jarayseh, Giulia Masoero, Pierre Bize   +2 more
wiley   +1 more source

Modeling the determinants of smoking behavior among young adults in Khuzestan province: a two-level count regression approach

Frontiers in Public Health
PurposeThis study investigates the determinants of smoking behavior among young adults in Khuzestan province, southwest Iran, using two-level count regression models. Given the high prevalence of smoking-related diseases and the social impact of smoking,
Homayoun Satyar, Kambiz Ahmadi Angali, Somayeh Ghorbani, Naser Kamyari, Maryam Seyedtabib   +4 more
doaj   +1 more source

A sequential quadratic Hamiltonian‐based estimation method for Box‐Cox transformation cure model

Statistica Neerlandica, Volume 80, Issue 3, August 2026.
ABSTRACT We propose an enhanced estimation method for the Box‐Cox transformation (BCT) cure rate model parameters by introducing a generic maximum likelihood estimation algorithm, the sequential quadratic Hamiltonian (SQH) scheme, which is based on a gradient‐free approach.
Phuong Bui, Varun Jadhav, Suvra Pal, Souvik Roy   +3 more
wiley   +1 more source

Goodness-of-Fit Tests for COM-Poisson Distribution Using Stein's Characterization

Austrian Journal of Statistics
A crucial part of data analysis is to assess the adequacy of the fit of the probability models used, and such assessment is generally made using the goodness-of-fit tests.
Traison T, V S Vaidyanathan
doaj   +1 more source