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    How do I add confidence ellipses around groups of samples?

Possible Solutions:

    Version 4.1 introduces class-based confidence ellipses. Any figure which includes classes (see our FAQ item about setting classes in data) can now have statistically-based confidence ellipses drawn around each class. In the Plot Controls figure, select the View/Classes/Outline Class Groups menu. There you will find various options to enclose classes including connecting the points which are on the border of the class cluster (Border Points) or drawing a confidence ellipse around each class. This second option calculates the Hotelling's T2 confidence ellipse around each class. The particular confidence level can be set using the same menu. Note that class zero samples never have a confidence ellipse drawn around them because class zero is considered "unknown" (i.e. no class). To get an ellipse around these points, they must be assigned a non-zero class number.

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