Page 62 - niengiam2022

Formula:

I
IR (‰) = × 1000
P tb

Where:

IR: In-migration rate;
I: Number of in-migrants in 12 months prior to the reference period;

P tb: Average population in the reference period.

Out-migration rate reflects the number out-migrants of a territorial unit
in the reference period on average per 1000 population of that territorial unit.

Formula:
O
OR (‰) = × 1000
P tb
Where:

OR: Out-migration rate;

O: Number of out-migrants in 12 months prior to the reference period;
P tb: Population up to the reference time-point.

Net-migration rate reflects the status of in-migration and out-
migration of population into/out from a territorial unit in the reference
period. It is the difference between number of in-migrants and number of
out-migrants of a territorial unit on average per 1000 population of that
territorial unit.

Formula:
I - O
NR (‰) = × 1000
P tb

Where:
NR: Net-migration rate;

I: Number of in-migrants in 12 months prior to the reference period;

O: Number of out-migrants in 12 months prior to the reference period;
P tb: Population up to the reference time-point.

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