When a plot shows thousands of points, the mass of points can be too dark to show patterns in density. Using the Nonpar Density (nonparametric density) option makes it easier to see the patterns.
Bivariate density estimation models a smooth surface that describes how dense the data points are at each point in that surface. The plot adds a set of contour lines showing the density (Example of Nonpar Density). The contour lines are quantile contours in 5% intervals. This means that about 5% of the points are below the lowest contour, 10% are below the next contour, and so on. The highest contour has about 95% of the points below it.
Example of Nonpar Density
Press Shift and select Nonpar Density from the Bivariate red triangle menu. Enter a larger value than the default 51 points.
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