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On Influencing Population Means

open access: yesEpidemiology, 2012
Findings on the existence or the lack of temporal trends in sperm concentration at the population level have been used to discuss the role of environmental factors (including endocrine disruptors) on male fertility. An assumption sometimes made 1 is that temporal trends in biological parameters such as sperm concentration will parallel temporal trends ...
Slama, Rémy, Siroux, Valérie
openaire   +5 more sources

Comparison of lognormal population means [PDF]

open access: yesProceedings of the American Mathematical Society, 1994
Comparisons of two lognormal population means are investigated. For large samples, the conventional test for significance of the population means is the ordinary Student t-test with normal critical value. By Chen and Loh’s result (Ann. Statist. 20 (1992)), however, the transformed t-test based on log-data is asymptotically more powerful than the ...
openaire   +1 more source

Persistence time of SIS infections in heterogeneous populations and networks [PDF]

open access: yes, 2017
For a susceptible-infectious-susceptible (SIS) infection model in a heterogeneous population, we present simple formulae giving the leading-order asymptotic (large population) behaviour of the mean persistence time, from an endemic state to extinction of
Clancy, Damian
core   +2 more sources

Two Populations Mean-Field Monomer–Dimer Model [PDF]

open access: yesJournal of Statistical Physics, 2018
A two populations mean-field monomer-dimer model including both hard-core and attractive interactions between dimers is considered. The pressure density in the thermodynamic limit is proved to satisfy a three-dimensional variational principle. A detailed analysis is made in the limit in which one population is much smaller than the other and a ...
Alberici, Diego, Mingione, Emanuele
openaire   +4 more sources

Ratio Estimators in Simple Random Sampling Using Information on Auxiliary Attribute [PDF]

open access: yes, 2008
Some ratio estimators for estimating the population mean of the variable under study, which make use of information regarding the population proportion possessing certain attribute, are proposed.
Chauhan, Pankaj   +3 more
core   +6 more sources

Dynamical Mean Field approximation of a canonical cortical model for studying inter-population synchrony [PDF]

open access: yes, 2011
The goal of this paper is twofold. We propose and explore a model to study the synchronization among populations in the canonical model of the neocortex proposed previously by (R.J. Douglas, K.A.C. Martin, A functional microcircuit for cat visual cortex.
Ramó, Roberto Carlos Sotero Diaz
core   +2 more sources

On the regression method of estimation of population mean from incomplete survey data through imputation [PDF]

open access: yes, 2005
When some observations in the sample data are missing, the application of the regression method is considered for the estimation of population mean with and without the use of imputation.
Shalabh, Toutenburg, Helge
core   +2 more sources

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