Demographic statistics

﻿
Demographic statistics

Among the kinds of data that national leaders need are the demographic statistics of their population. Records of births, deaths, marriages, immigration and emigration and a regular census of population provide information that is key to making sound decisions about national policy.

A useful summary of such data is the population pyramid. It provides data about the sex and age distribution of the population in an accessible graphical format.

Another summary is called the life table. For a cohort of persons born in the same year, it traces and projects their life experiences from birth to death. For a given cohort, the proportion expected to survive each year (or decade in an abridged life table) is presented in tabular or graphical form.

The ratio of males to females by age indicates the consequences of differing mortality rates on the sexes. Thus, while values above one are common for newborns, the ratio dwindles until it is well below one for the older population.

Wikimedia Foundation. 2010.

Look at other dictionaries:

• Demographic estimates of the German exodus from Eastern Europe — are still a controversial topic. Estimates of the number of displaced Germans vary in the range of 13.5 16.5 million.Estimates of total deaths of German civilians have ranged from as low as 500,000 to as high as 3 million. The standard figure… …   Wikipedia

• Demographic economics — or population economics is the application of economics to demography, the study of human populations, including size, growth, density, distribution, and vital statistics.[1] Analysis includes economic determinants and consequences of marriage… …   Wikipedia

• Statistics — is a mathematical science pertaining to the collection, analysis, interpretation or explanation, and presentation of data. Also with prediction and forecasting based on data. It is applicable to a wide variety of academic disciplines, from the… …   Wikipedia

• Statistics South Africa — is the national statistics board of South Africa. It was established after the Statistics Act, no. 6 of 1999, was passed by the Parliament of South Africa. Statistics South Africa was established with the goal of producing timely, accurate, and… …   Wikipedia

• STATISTICS — Official Statistics Prior to the 19th century, statistical data on Jews were obtained irregularly, either from mere estimates, or as a by product from administrative records specifically relating to Jews. As modern official statistics developed… …   Encyclopedia of Judaism

• Demographic estimates of the flight and expulsion of Germans — Flight and expulsion of Germans during and after World War II (demographic estimates) Background …   Wikipedia

• Demographic history of the United States — This article is about the demographic history of the United States. Contents 1 Historical population 2 Age at marriage 3 Immigration 3.1 Earlier Colonial era …   Wikipedia