نتایج جستجو برای: overdispersion

تعداد نتایج: 555  

2013
Jeremy J. Berg Graham Coop

Adaptation in response to selection on polygenic phenotypes occurs via subtle allele frequencies shifts at many loci. Current population genomic techniques are not well posed to identify such signals. In the past decade, detailed knowledge about the specific loci underlying polygenic traits has begun to emerge from genome-wide association studies (GWAS). Here we combine this knowledge from GWAS...

Journal: :Social science & medicine 2008
Jennifer Ahern Sandro Galea Alan Hubbard Adam Karpati

Variability in the health of human populations is greater in economically vulnerable areas. We tested whether this variability reflects and can be explained by: (1) underlying vulnerabilities and capacities of populations and/or (2) differences in the distribution of individual socioeconomic status between populations. Health outcomes were rates of mortality from 12 causes (cardiovascular disea...

2017
Xinyan Zhang Himel Mallick Nengjun Yi

Motivation: The human microbiome plays an important role in human health and disease. The composition of the human microbiome is influenced by multiple factors and understanding these factors is critical to elucidate the role of the microbiome in health and disease and for development of new diagnostics or therapeutic targets based on the microbiome. 16S ribosomal RNA (rRNA) gene targeted ampli...

2015
Paul C D Johnson Sarah J E Barry Heather M Ferguson Pie Müller

'Will my study answer my research question?' is the most fundamental question a researcher can ask when designing a study, yet when phrased in statistical terms - 'What is the power of my study?' or 'How precise will my parameter estimate be?' - few researchers in ecology and evolution (EE) try to answer it, despite the detrimental consequences of performing under- or over-powered research. We ...

Journal: :Communications in Statistics 2021

We focus on the development of diagnostic tools and an R package called MNB for a multivariate negative binomial (MNB) regression model detecting atypical influential subjects. The is deduced from Poisson mixed in which random intercept follows generalized log-gamma (GLG) distribution. correlated count data leads to that inherits features hierarchical accommodate intraclass correlation occurren...

2017
Igor Shuryak Bradford D. Loucas Michael N. Cornforth

Recent technological advances allow precise radiation delivery to tumor targets. As opposed to more conventional radiotherapy-where multiple small fractions are given-in some cases, the preferred course of treatment may involve only a few (or even one) large dose(s) per fraction. Under these conditions, the choice of appropriate radiobiological model complicates the tasks of predicting radiothe...

2002
Daniel B. HALL Kenneth S. BERENHAUT

Hall (2000) has described zero-inflated Poisson and binomial regression models that include random effects to account for excess zeros and additional sources of heterogeneity in the data. The authors of the present paper propose a general score test for the null hypothesis that variance components associated with these random effects are zero. For a zero-inflated Poisson model with random inter...

2017
Gökmen Zararsız Dincer Goksuluk Selcuk Korkmaz Vahap Eldem Gozde Erturk Zararsiz Izzet Parug Duru Ahmet Ozturk

RNA sequencing (RNA-Seq) is a powerful technique for the gene-expression profiling of organisms that uses the capabilities of next-generation sequencing technologies. Developing gene-expression-based classification algorithms is an emerging powerful method for diagnosis, disease classification and monitoring at molecular level, as well as providing potential markers of diseases. Most of the sta...

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