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migration of people to a specific location because relatives or members of the same nationality previously migrated there
distance decay function
The diminishing in importance and eventual disappearance of a phenomenon with increasing distance from its origin.
A mathematical formula that describes the level of interaction between two places, based on the size of their populations and their distance from each other.
Only people exhibiting certain characteristics in a population choosing to migrate.
people who are forced to migrate from thier home country and cannot return for fear of persecution because of thier race, religion, nationality, membership of a social group, of political opinion
the distance beyond which cost, effort, and/or means play a determining role in the willingness of the people to travel
The presence of a nearer opportunity that greatly diminishes the attractiveness of sites farther away.
The set of all points that can be reached by an individual given a maximum possible speed from a starting point in space-time and an ending point in space-time.
migration to a distant destination that occurs in stages, for example, from farm to nearby village and later to a town and city
a seasonal periodic movement of pastoralists and their livestock between highland and lowland pastures
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