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gravity model
Gravity models are used in various social sciences to predict and describe certain behaviors that mimic gravitational interaction as described in Isaac Newton's law of gravity. Generally, the social science models contain some elements of mass and distance, which lends them to the metaphor of physical gravity.
Social science gravity models:
*Gravity model of trade
*Trip distribution
*Gravity model of migration
*Two-step floating catchment area (2SFCA) method
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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