Topic
proxy.
variable used in statistics and experimental design: not in itself directly relevant, but that serves in place of an unobservable or immeasurable variable
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About proxy
In statistics, a proxy or proxy variable is a variable that serves in place of an unobservable or immeasurable variable, while not being otherwise relevant in its own right. In order for a variable to be a good proxy, it must have a close correlation, not necessarily linear, with the variable of interest. This correlation might be either positive or negative.
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