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i. Immigration & Emigration

ii. In-migration & out-migration

iii. Gross Migration & Net Migration

iv. Internal Migration

Internal migration is the movement of people

Gross migration is the

Four types of migration rates are commonly used.

i. In-migration rate, I/P i.e I divided by P

ii. Out migration, O/P

iii. The gross migration rate, (I+O)/P

iv. The net migration rate, (I-O)/P

Where, I is the number of in-migrants during a specified time to a given area.

O is the number of out migrants during a specified time from a given area.

P is the population of the given area at either at the beginning, end or the midpoint of the migration interval.

In any given area, the number of net migrants during an interval between two censuses can be estimated by the method of a balancing equation as follows,

Net migration = P

Where,

n is the intercensal interval,

P

P

**Types of Migration:**Followings are the different types of migration given by the demographers & sociologists.i. Immigration & Emigration

ii. In-migration & out-migration

iii. Gross Migration & Net Migration

iv. Internal Migration

**Immigration & Emigration:****Immigration**is coming from one country to another.**Emigration**is going from one country to another.**In-migration & out-migration:****In-migration**is the migration within a particular area.**Out migration**is the migration out of a particular area. These two types of migrations are applicable to**internal**migration.**Internal migration:**Internal migration is the movement of people

__within__the country. Its range is from a few kilometers to several thousand kilometers. In this type of migration, people are changing their residence from one town to another and one village to another due to marriage, occupation etc.**Gross-migration:**Gross migration is the

**volume**of migration. It is the total number of arrivals of immigrants and departure of in-migrants and out migrants.**Net migration**is the balance of migration. It is the difference between the total number of persons coming in and leaving out or the difference between immigrants and emigrants.**Basic measures of migration:**Four types of migration rates are commonly used.

i. In-migration rate, I/P i.e I divided by P

ii. Out migration, O/P

iii. The gross migration rate, (I+O)/P

iv. The net migration rate, (I-O)/P

Where, I is the number of in-migrants during a specified time to a given area.

O is the number of out migrants during a specified time from a given area.

P is the population of the given area at either at the beginning, end or the midpoint of the migration interval.

**Balancing equation method:**In any given area, the number of net migrants during an interval between two censuses can be estimated by the method of a balancing equation as follows,

Net migration = P

_{t+n}- P_{t}-_{n}B_{t }-_{n}D_{t}Where,

n is the intercensal interval,

P

_{t+n}is the population of the area at time (t+n)P

_{t}is the population of the area at time t_{n}B_{t}is the number of births occurring during the interval t to (t+n)._{n}D_{t}is the number of death occurring during the interval t to (t+n).
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