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AT
AT
Level V

Mahalanobis distance in JMP differs from other methods

Jan 26, 2018 05:19 PM (5278 views)

Hi,

I am comparing Mahalanobis distance calculated by JMP vs. one reported in other tables using their software. The JMP reports for MD 2.35 +/- .54 vs. 1.23 +/- 0.68 . I was wondering if there is anything special about JMP. I have 30 data points with 6 variables.

 

I appreciate any comments. Thanks

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txnelson
Super User txnelson
Super User
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Re: Mahalanobis distance in JMP differs from other methods

Jan 26, 2018 05:43 PM (5529 views)  |  Posted in reply to message from AT 01-26-2018

Here is the calculation used in JMP for Mahalanobis, taken from 

     Help==>Books==>Multivariate Methods

Is it different from your undefined product?

nahalanobis.PNG

Jim

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txnelson
Super User txnelson
Super User
Solution

Re: Mahalanobis distance in JMP differs from other methods

Jan 26, 2018 05:43 PM (5530 views)  |  Posted in reply to message from AT 01-26-2018

Here is the calculation used in JMP for Mahalanobis, taken from 

     Help==>Books==>Multivariate Methods

Is it different from your undefined product?

nahalanobis.PNG

Jim
AT
AT
Level V

Re: Mahalanobis distance in JMP differs from other methods

Jan 27, 2018 07:16 PM (5228 views)  |  Posted in reply to message from txnelson 01-26-2018

Thanks Jim for the reply and definition of MD in JMP. The one I like to use is Mahalanobis distance defined in Mahalanobis Taguchi System (MTS). I have attached the definition in the attached file. It looks like there are differences. 

 

Anyone has used MTS method in JMP? ThanksMD in MTS.png

 

 

 
 
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David_Burnham
Super User (Alumni) David_Burnham
Super User (Alumni)

Re: Mahalanobis distance in JMP differs from other methods

Jan 28, 2018 10:13 PM (5201 views)  |  Posted in reply to message from AT 01-27-2018

More dodgy maths from Genichi Taguchi?

-Dave