Expectation of life

Japanese: 平均余命 - へいきんよめい（英語表記）expectation of life

The expected number of years that a person age x can survive is called life expectancy at age x. Life expectancy at age x is calculated with certain rules by creating a life table from the age-specific mortality rate of the observed population. A life table shows the number of survivors to a given age and the average life expectancy at a given age, by sex, under the assumption that 100,000 people born at the same time die at the day, month, and age-specific mortality rate of the observed population. It usually consists of functions of (1) mortality rate, (2) survival rate, (3) number of survivors, (4) stationary population (steady-state population), (5) number of years lived, and (6) average life expectancy. There are complete life tables, which are created based on the vital statistics (final numbers) and census population of the annual census conducted every five years, and simplified life tables, which are created using vital statistics (approximate numbers) and estimated population.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

x歳の人の今後生存しうる予想年数をx歳平均余命という。x歳平均余命は，観察集団の年齢別死亡率が与えられれば，これから生命表を作成して，一定の約束のもとに算出される。生命表は，同時に出生した 10万人が観察集団の日齢，月齢，年齢別死亡率で死んでいくという仮定のもとに，任意の年齢までの生存者数や任意の年齢における平均余命などを男女別に表わすものである。通常，(1) 死亡率，(2) 生存率，(3) 生存数，(4) 静止人口 (定常人口) ，(5) 生存延年数，(6) 平均余命，の諸関数から成る。生命表には，5年毎に行われる国勢調査年次の人口動態統計 (確定数) と国勢調査人口に基づき作成する完全生命表と，人口動態統計 (概数) と推計人口を用いて作成される簡易生命表がある。

出典　ブリタニカ国際大百科事典小項目事典ブリタニカ国際大百科事典小項目事典について　情報

<<: Equal temperament (English spelling)

>>: Mean deviation