Demography

Demography is the study of human population dynamics. It encompasses the study of the size, structure and distribution of populations, and how populations change over time due to births, deaths, migration, and aging. Demographic analysis can relate to whole societies or to smaller groups defined by criteria such as education, religion, or ethnicity.

Data and Methods

Demography relies on large data sets that are primarily derived from censuses and registration statistics (i.e., birth, death, marriage registrations).

Demographic Indicators

Because demography is interested in changes in human populations, demographers focus on specific indicators of change. Two of the most important indicators are birth and death rates, which are also referred to as fertility (see also fecundity) and mortality.

The demographic Transition

The demographic transition is a model and theory describing the transition from high birth rates and death rates to low birth and death rates that occurs as part of the economic development of a country. In pre-industrial societies, population growth is relatively slow because both birth and death rates are high. In most post-industrial societies, birth and death rates are both low. The transition from high rates to low rates is referred to as the demographic transition.