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. Demography is the study of human population dynamics. ...
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. A population pyramid is two back-to-back bar graphs, one showing the number of males and one showing females in a particular population in five-year age groups. ...
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. In actuarial science, a life table (sometimes called a mortality table) is a table of statistics giving information related to: the average probability of survival or death at different ages, remaining life expectancy the proportion of the original birth cohort still alive. ...
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.
Data have been collected from national statistical authorities since 1948 through a set of questionnaires dispatched annually by the United Nations Statistics Division to over 230 national statistical offices.
The United Nations Statistics Division is currently reviewing the Demographic Yearbook through Expert Group Meetings and technical reports aimed at reviewing progress in reporting by Member States.
The Demographic Yearbook disseminates statistics on population size and composition, births, deaths, marriage and divorce on an annual basis.
Facster™ is a freely accessible portal to all statistical facts relevant to government, politics, economics, and demographics in the entire world.
From the U.S. Census Bureau, a computerized data bank containing statistical tables of demographic, and socio-economic data for 227 countries and areas of the world.
From the U.S. Census Bureau: 1998 is the latest published compendium and analysis of data on population, fertility, mortality, contraceptive use and related demographic topics by the U.S. Census Bureau.
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