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Equation for Bivariate Normal Density Ellipse

lsamuelso

Community Trekker

Joined:

Jul 25, 2012

Is there a way to determine or retrieve the equation of the density ellipse which is plotted in the Bivariate platform?

I tried to generate these ellipses manually using the eigenvalues and eigenvectors of the covariance matrix, but it does not seem to match those plotted by JMP.  Is this spelled out in the documentation somewhere?  Is there some other source which describes how JMP generates these ellipses?