Results 221 to 230 of about 97,499 (261)

A Crowding Index for Finite Populations

Perceptual and Motor Skills, 1990
The classical definition of population density used in social science disciplines as a measure of density or physical crowding has severe shortcomings since actual spatial orientation is disregarded. A formula is proposed to measure physical crowding or population density which corrects the deficiency of the conventional formulation.
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Linkage disequilibrium in finite populations

Theoretical and Applied Genetics, 1968
A theoretical investigation has been made of the influence of population size (N) and recombination fraction (c) on linkage disequilibrium (D) between a pair of loci. Two situations were studied: (i) where both loci had no effect on fitness and (ii) where they showed heterozygote superiority, but no epistacy.If the populations are initially in linkage ...
W G, Hill, A, Robertson
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Stochastic gain in finite populations

Physical Review E, 2008
Flexible learning rates can lead to increased payoffs under the influence of noise. In a previous paper [Traulsen, Phys. Rev. Lett. 93, 028701 (2004)], we have demonstrated this effect based on a replicator dynamics model which is subject to external noise.
Röhl, T., Traulsen, A., Claussen, J., Schuster, H.   +3 more
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ESS-theory for finite populations

Biosystems, 1981
On the basis of some principles from the philosophy of science, the inadequacy of the ESS-theory as introduced by Maynard Smith and Price as a biological theory is discussed, and an improved ESS-theory for finite populations is presented which can adopt the ideas of the original formalism, although modified.
B, Thomas, H J, Pohley
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Markov sampling for finite populations

Biometrika, 1992
Summary: We have introduced a new sampling scheme for a finite population, called a Markov sampling scheme, which always provides distinct units for a fixed sample size. The utility of this sampling over conventional simple random sampling and systematic sampling is discussed for certain categories of labelled populations.
Chandra, K. Suresh, Sampath, S., Balasubramani, G. K.   +2 more
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Finite populations; foundation for inference?

Communications in Statistics, 1973
The theme of this paper is the extent to which the assumptions of the general linear hypothesis are justified by purposeful random sampling from a finite population. For three elementary models it is found that the square of the sample size divided by the population size must approach zero to insure substantial agreement between the two approaches ...
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Language evolution in finite populations

IEEE Conference on Decision and Control and European Control Conference, 2011
We study a simple game-theoretical model of language evolution in finite populations. This model is of particular interest due to a surprising recent result for the infinite population case: under replicator dynamics, the population game converges to socially inefficient outcomes from a set of initial conditions with non-zero Lesbegue measure.
Michael J. Fox, Jeff S. Shamma
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Social exclusion in finite populations

Physical Review E, 2015
Social exclusion, keeping free riders from benefit sharing, plays an important role in sustaining cooperation in our world. Here we propose two different exclusion regimes, namely, peer exclusion and pool exclusion, to investigate the evolution of social exclusion in finite populations.
Kun, Li, Rui, Cong, Te, Wu, Long, Wang
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Linkage disequilibria in finite populations

Theoretical Population Biology, 1986
Four-locus recombination frequencies are summarized into two-locus pair frequencies and three-locus frequencies, and further, into two-locus frequencies such that higher-order frequencies are linear functions of lower-order frequencies. Frequencies of gene combinations are defined according to their position on the same or distinct gametes, and linear ...
Cockerham, C. Clark, Tachida, Hidenori
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Multistage Index Selection in Finite Populations

Biometrics, 1991
Multistage selection with fixed proportions and selection indices based on covariates of the target variable is studied. Assuming a multivariate normal distribution before the selection, expressions are presented for the expectation and the variance of the target variable in the retained subpopulation. As the numerical evaluation for finite populations
Norell, Lennart, Arnason, Thorvaldur, Hugason, Kristinn   +2 more
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