|
Metodoloji izahlar
2. GENERAL INDICES OF POPULATION REPRODUCTION
The data on birth and death is obtained from the relevant birth and death registration forms compiled by Registration Office of the Ministry of Justice. Number of births includes only live-births.
Natural increase of population is equal the difference of number of the birth and death.
Crude birth and death rates is ratio of live birth and death to average annual size of the population. This indicator is calculated per 1000 population.
Annual average number of population - mathematically calculated average number for the beginning and the end of the year.
Natural increase rate is the difference of crude rate of birth and death. Crude rate of natural increase is usually used on estimation of population size under the influence of birth and death. The demographic situation and the changes related with that in a specific area are determined on the basis of the special indicators. Thus, the natural movement coefficient depends on sex and age composition of the population as well as number of birth and death during previous years. The migration also affects the sex-age composition of population.
Fertility rate reflects average number of birth per women during her reproductive period and it is calculated by multiplication of age rate of birth by length of each age interval.
At the result the sum should be divided by 1000, i.e. this indicator is calculated per women.
Life expectancy at birth (for 0 age) is an average number of years to be lived by person from a cohort of those born in a given year, if he (she) would be subjected in each age to the same mortality level experienced in the year(s) to which this indicator has been computed.
Crude reproduction rate (gross) covers the average number of girls that woman can deliver throughout her fertility period. This indicator shows the level of substitution of women by their daughters.
This indicator is calculated without taking into account death factor and by multiplication of fertility rate by the number of girls born during the accounted year. Gross reproduction rate of the population is calculated as fertility rate.
Share of girls born is considered as equal to 0.488 at all ages of women.
Net reproduction rateis calculated taking into account death factor. This rate is characterized average number of girls delivered by one woman throughout her fertility life and substitution of women by their daughters, who are achieved fertility age. Mainly the rate is calculated from averagely per women standpoint. This indicator may be calculated per 1000 women too.
If this rate is equal to 1.0, then birth and death rates provide simple reproduction rate of the population. If net reproduction rate is less or more than 1.0, then reproduction rate is reduced or increased.
|