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Scatter diagram

A diagram depicting the relation between two characteristics of a set of observations. Each point marked on the diagram shows an observation of the two characteristics, for example age and the income of an individual, measured on the two axes. This is often helpful in suggesting whether there is a likelihood of finding any significant statistical relation between the two characteristics, and what type of function it is worth trying to fit. It also draws attention to any outlying observations which may merit special investigation.

Reference: Oxford Press Dictonary of Economics, 5th edt.