Dyadic interaction matrices

How between an origin-destination dyad. Commonly, though not always, these matrices are square, with each origin also acting as a destination. The data may represent movements of persons, including work trips, consumer trips, recreational travel, aggregate travel, tourist travel, air and rail passengers, and migration; movements of goods, including commodity movements and gross freight flows; movement of vehicles, including road, rail, air and water traffic; information flows or contacts, including telephone calls, mail, messages, meetings, and diplomatic links; or financial transactions, including international trade and intersectoral transactions. In most situations, the interaction system has an identifiable spatial structure, but the spatial dimension is not a property of the dyadic interaction matrix, and is only introduced either by displaying the system on a map or by utilizing associated matrices based on variables such as distance

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