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PhamBao
PhamBao
Level IV

How to calculate UCL from Mahalanobis Distance

Created: Sep 24, 2022 04:10 AM  |  Last Modified: Jun 8, 2023 5:54 PM (9351 views)

Hi all,
Currently, I am using JMP 12 version
Do you know how to calculate UCL distance from Mahalanobis Distance chart?

 

If you guy know how to get it, could you please show me the formula?


Sincerely

PhamBao_0-1664006980261.png

 

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11 REPLIES 11
Mark_Bailey
Staff Mark_Bailey
Staff

Re: How to calculate UCL from Mahalanobis Distance

Oct 3, 2022 10:57 AM (1646 views)  |  Posted in reply to message from PhamBao 10-02-2022

I believe you are misusing the outlier analysis. It applies to linear correlations. You have a non-linear relationship between two variables. I would not expect it to correctly identify outliers and non-outliers in such a case.

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PhamBao
PhamBao
Level IV

Re: How to calculate UCL from Mahalanobis Distance

Oct 7, 2022 10:24 AM (1641 views)  |  Posted in reply to message from Mark_Bailey 10-03-2022
Hi Mark

Appreciate for your input. You are correct. Both variables are non-linear. Which method can I use to detect outliers from non-linear variables.
 
Sincerely,
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