Statistical Measures - Population

A population has a number of group characteristics that are statistical measures unique to the population group and are not the characteristics of the individual. These group characteristics are density, natality, mortality, immigration and emigration, age distribution, dispersion, growth, regulation and genetic composition. Density or size of population, however, is its basic characteristic and is affected, by other group characteristics such as natality, mortality, immigration and emigration. any change in the density of the population implies a change in one or more of these four characteristics. The relationship between these factors is expressed as follows: