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lsamuelso
lsamuelso
Level I

Equation for Bivariate Normal Density Ellipse

Jun 6, 2014 09:51 AM (4620 views)

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?

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1 REPLY 1
Byron_JMP
Staff Byron_JMP
Staff

Re: Equation for Bivariate Normal Density Ellipse

Sep 10, 2018 06:27 PM (3412 views)  |  Posted in reply to message from lsamuelso 06-06-2014

so a little history on how its calculated (really good old JMP stuff that seems to be missing from the current documentation)

http://biostat.jhsph.edu/courses/bio653/misc/JMPer%20Cable%20Summer%2098%20Why%20is%20it%20called%20...

 

Then there is Craige's blog on how to do it manually:  ( Kudos to @Craige_Hales )

https://community.jmp.com/t5/Uncharted/Ellipse/ba-p/21242

 

hopefully this helps, a little...

 

JMP Systems Engineer, Health and Life Sciences (Pharma)