http://support.sas.com/documentation/cdl/en/grstatproc/62603/HTML/default/viewer.htm#a003155742.htm
A scatter plot is a simple representation of data on a graph. There are only two variables and each dot on the graph represents a point. Usually it forms some sort of trend-line that can show a relationship. In this scatter plot, petal length and width of an Iris Petal are the two variables. As the petal increases in length, so does the petal width.

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