The GIS Dictionary provides definitions for GIS terms related to operations such as analysis, GIS modeling and web-based GIS, cartography, and Esri software.
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weight
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[mathematics]
A number that indicates the importance of a variable or measure for a particular calculation. The larger the weight assigned, the more the variable will influence the outcome.
[modeling]
The process of assigning a value to a feature according to its importance.
[mathematics]
A measure of the relative contribution or influence that one attribute makes to the whole.