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1 Biological population densities 1.1 Human densities 1.2 Countries and dependent territories 1.3 Other methods of measurement 2 See also 2.1 Lists of entities by population density 3 References 4 External links Toggle the table of contents Population density 131 languages Afrikaans Alemannisch العربية Aragonés Arpetan Asturianu Авар Azərbaycanca
Population dynamics is the type of mathematics used to model and study the size and age composition of populations as dynamical systems . Contents 1 History 2 Logistic function 3 Intrinsic rate of increase 4 Epidemiology 5 Geometric populations 5.1 Doubling time 5.2 Half-life of geometric populations 5.3 Geometric (R) growth constant
A demographic structure of a population is how populations are often quantified. The total number of individuals in a population is defined as a population size, and how dense these individuals are is defined as population density. There is also a population’s geographic range, which has limits that a species can tolerate (such as temperature).
Density estimation (Redirected from Density Estimation) Demonstration of density estimation using Kernel density estimation: The true density is mixture of two Gaussians centered around 0 and 3, shown with solid blue curve. In each frame, 100 samples are generated from the distribution, shown in red.
The generally accepted definition of Allee effect is positive density dependence, or the positive correlation between population density and individual fitness. It is sometimes referred to as "undercrowding" and it is analogous (or even considered synonymous by some) to "depensation" in the field of fishery sciences.
In ecology, a population is a group of organisms of the same species who inhabit the same particular geographical area and are capable of interbreeding.   The area of a sexual population is the area where inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals from other areas. 
The physiological density or real population density is the number of people per unit area of arable land . A higher physiological density suggests that the available agricultural land is being used by more and may reach its output limit sooner than a country that has a lower physiological density.