Page 72 - nien giam thong ke 2022
P. 72

Formula:
                                                          B - D
                                               NIR  =            ×  1000
                                                           P tb
                            Where:
                            NIR: Natural Increase Rate of population;
                            B: Total number of live births in the reference period;
                            D: Total number of deaths in the reference period;

                            P tb: Average population in the reference period.
                            Growth rate of population (growth rate) reflects the increase/decrease of
                        the population in reference period due to natural increase and net-migration.
                        Growth rate of population is expressed as a percentage or per mille.
                            In-migration rate are the number of people from different territorial
                        units  (out-migration  place)  in-migrate  to  a  territorial  unit  in  the  reference
                        period (usually a calendar year) on an average per 1,000 population of that
                        territorial unit (in-migration place).
                            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 1,000 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.

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