Migration rate refers to the phenomenon measuring relatively the volume of changes of residence - migration. Migration may be temporary or permanent. Demography mainly examines permanent migration, which is regarded as changes of residence lasting at least one year. However, in several countries even a shorter time can be considered as "permanent" changes of residence.
Migration is mainly studied within or between administrative boundaries of areas. In migration distinction is made between internal migration, i.e. changes of residence within the borders of the country, and international migration (immigration and emigration) across the borders of the country.
Finland's migration statistics distinguish inter-municipal migration from intra-municipal migration. Migration statistics examine the volume of migration. One individual may have moved several times during the same year. Therefore the number of persons moving in a year is smaller than the total volume of migration in the statistics.
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