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2. ### Population density - Wikipedia

en.wikipedia.org/wiki/Population_density

Population density (in agriculture: standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geographical term. [1] In simple terms, population density refers to the number of people living in an area per square kilometre or other ...

3. ### Allee effect - Wikipedia

en.wikipedia.org/wiki/Allee_effect

Allee effects are classified by the nature of density dependence at low densities. If the population shrinks for low densities, there is a strong Allee effect. If the proliferation rate is positive and increasing then there is a weak Allee effect. The null hypothesis is that proliferation rates are positive but decreasing at low densities.

4. ### Population ecology - Wikipedia

en.wikipedia.org/wiki/Population_ecology

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).

5. ### Probability density function - Wikipedia

en.wikipedia.org/wiki/Probability_density_function

In probability theory, a probability density function ( PDF ), density function, or density of an absolutely continuous random variable, is a function whose value at any given sample (or point) in the sample space (the set of possible values taken by the random variable) can be interpreted as providing a relative likelihood that the value of ...

6. ### Statistics - Wikipedia

en.wikipedia.org/wiki/Statistics

Statistics (from German: Statistik, orig. "description of a state, a country") [1] [2] is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data. [3] [4] [5] In applying statistics to a scientific, industrial, or social problem, it is conventional to begin with a statistical population or a ...

7. ### Population dynamics - Wikipedia

en.wikipedia.org/wiki/Population_dynamics

Population dynamics has traditionally been the dominant branch of mathematical biology, which has a history of more than 220 years, [1] although over the last century the scope of mathematical biology has greatly expanded. [citation needed] The beginning of population dynamics is widely regarded as the work of Malthus, formulated as the ...