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Where:

NR: Net-migration rate;

IR: In-migration rate;

OR: Out-migration rate.

Life expectancy at birth reflects the prospect of a newborn could live for
how many years if the current mortality model is maintained, this is the key
statistical indicator of the Life table.
T
e = 0
0
l 0

Where:

e0: Life expectancy at birth (unit: year);

T0: Total number of years of the newborns in the Life table who will continue
to live;

l0: Number of persons who live to the age of 0 of the Life table (the set of
original newborns is observed).

Life expectancy at birth is one of the integrated indicators calculated from the
Life table.
The Life table is a statistical table that includes the indicators showing the
viability of population moving from one age to the next and the mortality of the
population at different ages. The Life table shows that from an initial set of the

births (on the same cohort), there will be how many persons who will live to 1 year,
2 years,..., 100 years,...; among them, there are how many persons at each of the
certain ages who will be dead before the following age; those persons who have
reached a certain age will have what probability of survival and death; how long is
the life expectancy in the future.

Rate of literate population aged 15 and over reflects the ability of reading
and writing of the population, serves to assess the development level of a country,
region or locality.

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