Population pyramid
Population Pyramid
A Population Pyramid (pronunciation: /ˌpɒpjʊˈleɪʃən ˈpɪrəmɪd/) is a graphical representation that illustrates the distribution of various age groups in a population, which forms the shape of a pyramid when the population is growing. It is also known as an "age-sex pyramid".
Etymology
The term "Population Pyramid" is derived from the graphical representation of the population that, when growing, tends to resemble a pyramid. The word "population" comes from the Latin populus meaning "people", and "pyramid" comes from the Greek pyramis meaning "wheat cake", due to the shape of these ancient Egyptian structures.
Description
A Population Pyramid is typically expressed as a dual-bar horizontal histogram with each bar representing a particular age group, gender, or social category. The left side of the pyramid typically represents the male population while the right side represents the female population. Each bar's length represents the number of individuals in that category.
Types of Population Pyramids
There are three types of Population Pyramids:
- Expansive - A pyramid with a wide base, indicating a high birth rate and high death rate.
- Constrictive - A pyramid with a narrow base, indicating a low birth rate and low death rate.
- Stationary - A pyramid with a rectangular shape, indicating a stable population.
Uses of Population Pyramids
Population Pyramids are used by demographers, sociologists, and government bodies to understand the age and sex structure of a population. They are also used to predict future population trends and to plan for various needs such as healthcare, education, and employment.
Related Terms
- Demography - The statistical study of populations.
- Census - An official count or survey of a population.
- Birth Rate - The number of live births per thousand of population per year.
- Death Rate - The number of deaths per thousand of population per year.
External links
- Medical encyclopedia article on Population pyramid
- Wikipedia's article - Population pyramid
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