Mass Appraisal and Automated Valuation Models
Automated valuation models (AVMs) are growing in acceptance. These rely on statistical models such as multiple regression analysis or geographic information systems (GIS). While AVMs can be quite accurate, particularly when used in a very homogeneous area, there is also evidence that AVMs are not accurate in other instances such as when they are used in rural areas, or when the appraised property does not conform well to the neighborhood. AVM's have also gained favor in class action litigation, and have been substantiated in numerous cases, both in Federal and state courts, as the appropriate method for dealing with large-scale real estate litigation problems, such as contaminated neighborhoods
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