Faq how do I add confidence ellipses around groups of samples

Issue:

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. The confidence ellipse 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.

There are two ways to show confidence ellipses:

1. Using Plot Controls window
   
2. Using ''Connect Classes'' button
   

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