A scatterplot, scatter diagram or scatter graph is a
chart that uses
Cartesian coordinates to display values for two
variables. The data is displayed as a collection of points, each having one coordinate on the horizontal axis and one on the vertical axis.A scatterplot does not specify dependent or independent variables. Either type of variable can be plotted on either axis. Scatterplots represent the association (not
causation) between two variables.A scatterplot can show various kinds of relationships, including positive (rising), negative (falling), and no relationship. If the pattern of dots slopes from lower left to upper right, it suggests a positive
correlation between the variables being studied. If the pattern of dots slopes from upper left to lower right, it suggests a negative correlation. A line of best fit can be drawn in order to study the correlation between the variables. An equation for the line of best fit can be computed using the method of
linear regression.
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A graphical technique to analyze the relationship between two variables. Two sets of data are plotted on a graph, with the y-axis being used for the variable to be predicted and the x-axis being used for the variable to make the prediction. The graph will show possible relationships (although two variables might appear to be related, they might not be: those who know most about the variables must make that evaluation). The scatter diagram is one of the "seven tools of quality."
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