Results 281 to 290 of about 22,265,852 (345)
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Null models in network neuroscience
Nature Reviews Neuroscience, 2022Recent advances in imaging and tracing technology provide increasingly detailed reconstructions of brain connectomes. Concomitant analytic advances enable rigorous identification and quantification of functionally important features of brain network architecture.
František Váša, Bratislav Mišić
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Null Models for the Opportunity for Selection
The American Naturalist, 2022AbstractCrow’s ‘Opportunity for Selection’ (I=variance in relative fitness) is an important albeit controversial eco-evolutionary concept, particularly regarding the most appropriate null model(s). Here we treat this topic in a comprehensive way by considering opportunities for both fertility selection (If) and viability selection (Im) for discrete ...
Robin S, Waples, Thomas E, Reed
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Journal of Biogeography, 2019
Ecological niche modelling requires robust estimation of model performance and significance, but common evaluation approaches often yield biased estimates. Null models provide a solution but are rarely used in this field.
Corentin L. Bohl, J. Kass, R. Anderson
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Ecological niche modelling requires robust estimation of model performance and significance, but common evaluation approaches often yield biased estimates. Null models provide a solution but are rarely used in this field.
Corentin L. Bohl, J. Kass, R. Anderson
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Comments on Wilson's Null Model
Oecologia, 1987We agree with several of Wilson's general observations concerning the difficulties and pitfalls of this approach to distributional ecology. We disagree on two of his main points, however. First, he has not correctly discussed our own procedure. Second, the model he has produced contains a serious flaw. Related to this second point, we find his analysis
M E, Gilpin, J M, Diamond
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Annual Review of Ecology and Systematics, 1983
What determines the particular combinations of species found in biological communities, the number of those species, and their relative abundance? These questions are of perennial interest to ecologists, who often cite the influence of various factors-competition, predation, climate, nutrient availability, and chance dispersal events, to name a few ...
P H Harvey +3 more
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What determines the particular combinations of species found in biological communities, the number of those species, and their relative abundance? These questions are of perennial interest to ecologists, who often cite the influence of various factors-competition, predation, climate, nutrient availability, and chance dispersal events, to name a few ...
P H Harvey +3 more
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A Null Model of Morphospace Occupation
The American Naturalist, 2005Progress in understanding the relationship between lineage diversity, morphological diversity, and morphospace dynamics has been hampered by the lack of an appropriate null model of morphospace occupation. In this article, we introduce a simple class of models based on branching random walks (BRWs) for continuous traits.
Pie, Marcio R., Weitz, Joshua S.
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Null models for null hypotheses in taxonomy: a test using Scyphozoa
Biological Journal of the Linnean Society, 2021Abstract Although molecular tools are becoming more important in the delineation of scyphozoan species there is, perforce, a need to substantiate new species definitions using morphological data. Access to type material is often difficult and detailed, raw morphometric data are rarely provided in older type descriptions, which makes ...
Michael K Brown, Mark J Gibbons
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NULL MODEL ANALYSIS OF SPECIES NESTEDNESS PATTERNS
Ecology, 2007Nestedness is a common biogeographic pattern in which small communities form proper subsets of large communities. However, the detection of nestedness in binary presence-absence matrices will be affected by both the metric used to quantify nestedness and the reference null distribution.
Werner, Ulrich, Nicholas J, Gotelli
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Faddeev null-plane model of the nucleon
Physical Review C, 1995The nucleon is formulated as a relativistic system of three constituent quarks interacting via a zero-range two-body force in the null plane. The covariance of the null-plane Faddeev-like equation under kinematical front-form boosts is discussed. The nucleon wave function is obtained from the numerical solution of the Faddeev equation in the null plane.
, de Araújo WR +2 more
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P Values for Composite Null Models
Journal of the American Statistical Association, 2000Abstract The problem of investigating compatibility of an assumed model with the data is investigated in the situation when the assumed model has unknown parameters. The most frequently used measures of compatibility are p values, based on statistics T for which large values are deemed to indicate incompatibility of the data and the model.
M. J. Bayarri, James O. Berger
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