Death Rate and Migration
Death is as natural as birth. It can be also called mortality and it decreases the population. Generally, death rate can be calculated in four ways:
- Crude Death Rate (CDR)
- Age Specific Death Rate (ASDR)
- Infant Mortality Rate (IMR)
- Child Mortality Rate (CDR)
Crude Death Rate (CDR)
Crude death rate means the ratio of the total registered deaths of a particular year and mid-year population multiplied by 1000.
Crude Death Rate =
Age Specific death rate (ASDR)
Death is also called mortality. To find out age specific death rate, divide the total number of deaths in the specific age group in a year by the mid-year population of the same age group is the same year and multiply the result by 1000.
Age-Specific Death Rate =
i.e. ASDR =
Infant Mortality Rate (IMR)
An infant means a baby who is below one year age by the total number of live births of infants in the same year and multiplying the result by 1000.
Infant Mortality Rate=
Child Mortality Rate (CMR)
Child means the baby below 5 years of age. The child mortality rate is simply calculated as a ratio of child deaths above zero years and under 5 years of age registered in an official record year to the total number of live births registered in the same year multiplied by 1000.
Migration means the movement of people from one place to another to work or to live. The movement of people within the country is called internal migration and the movement of people from one country to another is called international migration.
The people who shift from the original place are called out migrants and those people who live in their destination called in-migrants. In the same way people who shift from one country to another are called emigrants for departure and immigrants for the destination. The difference in the number of people due ti immigration and emigration in a country is called gross migration.
Various measures of migration are as follows: -
- In-Migration Rate
- Out-Migration Rate
- Net Migration Rate
- Gross Migration Rate
In-Migration Rate deals with the people coming in to a place or a country.
Out-Migration Rate deals with the people leaving the place of origin within or outside the country.
i.e. MR =
Net Migration Rate
Net Migration Rate refers to the difference of migrants. Net migration rate is the ratio of net-migration and the mid-year population in a year per every thousand population of that place.
Net-Migration Rate =
i.e. NMR =
Gross Migration Rate
Gross Migration Rate deals with the measurement of the total volume of migration or population turnover a country or a place is experiences in a particular year.
Gross Migration Rate=
Gross Migration Rate =