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Or: NR = IR - OR

Where:

NR: Net-migration rate;

IR: In-migration rate;
OR: Out-migration rate.

Data on In-migration rate, Out-migration rate and Net-migration rate

of the whole Country, 06 socio-economic regions and 63 provinces/cities
under the Central is only calculated for internal migration (not including
international migration).

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:

e : Life expectancy at birth (unit: year);
0
T : Total number of years of the newborns in the Life table who will
0
continue to live;

l : Number of persons who live to the age of 0 of the Life table (the
0
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

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