The demography (of the Greek demonstrations meaning people ) is the quantitative study of the Population S and their dynamic, starting from characteristics such as the Natalité, the Fécondité, the Mortalité, the Nuptialité (or Conjugalité) and the migration. The task of the demographers consists in analyzing the variations of these phenomena in time and space, according to the socio-economic and cultural mediums.

The demographers have recourse to various methods to explain the demographic phenomena. They draw in particular from related knowledge of disciplines, like the Sociologie, the economy, the Géographie and the Histoire, so that their interpretation is just possible. Demography thus exceeds largely the framework of the analysis Statistique and makes it possible to study the phenomena affecting the populations from the total point of view.

The increase in the World population, in particular since the Industrial revolution, had a series of important incidences on the evolution of the companies and the nations in the world, in particular constituting a brake with the development beyond of a certain threshold. Demography became thus an invaluable instrument with the service of the political of populations (in particular, those of birth-control for countries like the China), but also with the industrial relations policies of many countries, in particular for the systems of Social Security, having to hold account for their forecasts of the number of individuals per age group: young people, active population, pensioners, calculable thanks to birth rates, of mortality, fruitfulness inter alia.

More recently, demography is also used in many market research, targeted on profiles of increasingly precise consumers.

Important indices

study of a population per age

• Population pyramid
• Aggregative index of old age
• demographic Report/ratio of dependence

study of a population per sex

• Rate of masculinity

study of the birthrate and the mortality of a population

• Rate of increase in the population AAGR
• Birth rate
• Death rate
• Fertility rate
• natural Balance
• Life expectancy
• Aggregative index of fruitfulness (STF)
• Gross reproduction rate
• Net reproduction rate (TNR)
• Crude death rate
• Marriage rate
• Indicating of the economic situation of firstly-marriage rate
• Rate of divorciality
• general Fertility rate
• rough Rate of birthrate
• Index of human development

study of the migrations

• Migratory balance
• total Rate of migration

Demography by areas and country

• World population

See too

• Increase in population
• demographic Decline
• Figures in population in historical France
• Demography
• demographic Overpopulation
• Ageing
• demographic Transition
• Population forecast
• demographic Projection
• Geography
• Ecology for the populations
• Biology of the populations
• stable Population

External bond

• International committee of Co-operation in national Research in Demography

Be-X-old: Дэмаграфія Fiu-vro: Demograafia