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.
Scatterplots (also known as scatterplots or scatterplots) are used to study possible relationships between two variables (see the example in Figure 1 below). Although these scatterplots cannot prove that one variable causes a change in the other, they do indicate, where relevant, the existence of a relationship, as well as the strength of that relationship. A scatter plot consists of a horizontal axis that contains the measured values of one variable (independent variable) and a vertical axis that represents the measurements of the other variable (dependent variable).
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