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Dân số và lao động - Population and labour 43
EXPLANATION OF TERMINOLOGY, CONTENT AND METHODOLOGY
OF SOME STATISTICAL INDICATORS ON POPULATION AND LABOUR
POPULATION
Average population:
Average population is the average number of people for an entire
period, calculated by several the following methods:
If data is available at two time points (base and end of the short term, usually a year),
then use the following formula:
P
tb
=
P
0
+ P
1
2
Where:
P
tb
: Average population;
P
0
: Population at the base period;
P
1
: Population at the ending period.
If data is available at times evenly, then use the formula:
P
tb
=
P
0
+ P
1
+ .... + P
n-1
+
P
n
2
2
n
Where:
P
tb
: Average population;
P
0,1,...,n
: Population at time points of 0, 1,..., n;
n : Number of equal time points.
If data are available at times unequal spaces, using the formula:
P
tb
=
P
tb1
t
1
+ P
tb2
t
2
+ .... + P
tbn
t
n
∑t
i
Where:
P
tb1
: Average population of the first duration;
P
tb2
: Average population of the second duration;
P
tbn
: Average population of the n
th
duration;
t
i
: Length of the n
th
duration.
Urban population
is the population of the territorial units to which the State is defined
urban areas.
Rural population
is the population of the territorial units to which the State is defined
rural areas.
Total growth rate of population:
Total growth rate of population (referred to as
"population growth rate") is the rate that the population is increased (or decreased) in one
period (usually for one calendar year) due to natural increase and net migration, are
expressed in percentage compared to the average population (or mid-year population).