![]() The first, !CorrEll, takes two variables and returns a set of data that can be used by the second macro, !Ellipse, to draw data ellipses based on the eigenvectors and eigenvalues of those 2 by 2 covariance matrices by group. Note there is an add-on utility for SPSS to draw ellipses in R graphics ( ScatterWEllipse.spd), but I wanted to give it a try in SPSS graphics. After reading Elliptical Insights: Understanding Statistical Methods through Elliptical Geometry (Friendly, Monette & Fox 2013) I was interested in trying ellipses out for viz.
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