Life expectancy tables are calculated based on death probabilities according to Farr's death rate method: qx = Mx / (Bx + (Mx/2)) where Mx = the number of deaths at the age of x to under x+1 years in the reported period; Bx = average population aged x to under x+1 in the base period; qx = death probability from age x .
The life table is constructed from census data and death registration data, it can also be constructed from vital registration or retrospective surveys.
Generally, they are constructed for age, gender, ethnic groups and occupational groups and so on..
There are two different types of life table: cohort and period.
This article explains the concept behind these and how they should each be used and interpreted..
A life table is a demographic tool used to analyse death rates and calculate life expectancies at various ages.
We calculate life tables separately for males and females because of their different mortality patterns.Jan 21, 2019.
Life tables are used to measure mortality, survivorship, and the life expectancy of a population at varying ages.
There are several types of life tables.
A generation or cohort life table is a life history of the mortality experiences of an actual cohort of individuals..
Abridged life table: A life table in which values of the life table functions are presented for certain age groups only, rather than for every single year of age..
For the terminal age group, ax =ex a x = e x because everyone surviving to the interval dies in the interval
One possible set of steps for calculating a complete period life table from deaths and mid-year population is: Estimate <5 ax from mx using gen_u5_ax_from_mx, and set ax over age 5 as n/2
Life expectancy is calculated using life tables
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
From this starting point, a number of statistics can be derived and thus also included in the table is: the proportion of the original birth cohort still alive
A life table is a table that includes information to describe the dying out of a birth cohort
This can also be a synthetic birth cohort, in which case we refer to it as a period life table
Life tables are one of the most important devices in demography – they have been used since the 1600s!
