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Mahalanobis distance in JMP differs from other methods

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

Accepted answers

txnelson

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

Help==>Books==>Multivariate Methods

Is it different from your undefined product?

All comments

txnelson

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

Help==>Books==>Multivariate Methods

Is it different from your undefined product?

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? Thanks MD in MTS.png

David_Burnham

More dodgy maths from Genichi Taguchi?