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extrapolation - [statistics] Using known or observed data to infer or calculate values for unobserved times, locations or other variables outside a sampled area. In the absence of data, extrapolation is a common method for making predictions, but it is not always accurate. For example, based on observed economic indicators, an economist can make predictions about the state of the economy at a future time. These predictions may not be accurate because they cannot take into account seemingly random events such as natural disasters.
[Category=Geospatial ]
Source: esri, 17 April 2012 09:36:17, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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