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Among the kinds of data that national leaders need are the demographic
Demography

Demography is the statistical study of all populations. It can be a very general science that can be applied to any kind of dynamic population, that is, one that changes over time or space ....
 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
Population pyramid

A population pyramid, also called age-sex pyramid and age structure diagram, is a graphical illustration that shows the distribution of various age groups in a population , which normally forms the shape of a 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
Life table

In actuarial science, a life table is a table which shows, for a person at each age, what the probability is that they die before their next birthday....
.






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Among the kinds of data that national leaders need are the demographic
Demography

Demography is the statistical study of all populations. It can be a very general science that can be applied to any kind of dynamic population, that is, one that changes over time or space ....
 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
Population pyramid

A population pyramid, also called age-sex pyramid and age structure diagram, is a graphical illustration that shows the distribution of various age groups in a population , which normally forms the shape of a 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
Life table

In actuarial science, a life table is a table which shows, for a person at each age, what the probability is that they die before their next birthday....
. 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.

See also

  • Demographic window
    Demographic window

    Demographic Window is defined to be that period of time in a nation's demographic evolution when the proportion of population of working age group is particularly prominent....


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