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**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 ...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.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).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 ...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 ...**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 ...