Demography

Demography (from Ancient Greek δῆμος (dêmos) 'people, society' and -γραφία (-graphía) 'writing, drawing, description') is the statistical study of human populations: their size, composition (e.g., ethnic group, age), and how they change through the interplay of fertility (births), mortality (deaths), and migration. Demographic analysis examines and measures the dimensions and dynamics of populations; it can cover whole societies or groups defined by criteria such as education, nationality, religion, and ethnicity. Educational institutions usually treat demography as a field of sociology, though there are a number of independent demography departments.

Extends: Demography, [Actuarial science](https://wikipedia.org.ai/Actuarial science), [Environmental social science](https://wikipedia.org.ai/Environmental social science), [Interdisciplinary subfields of sociology](https://wikipedia.org.ai/Interdisciplinary subfields of sociology), [Human geography](https://wikipedia.org.ai/Human geography)