topic Mahalanobis distance in JMP differs from other methods in Discussions

Mahalanobis distance in JMP differs from other methods

AT — Fri, 26 Jan 2018 22:19:20 GMT

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

Re: Mahalanobis distance in JMP differs from other methods

txnelson — Fri, 26 Jan 2018 22:43:37 GMT

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

Help==>Books==>Multivariate Methods

Is it different from your undefined product?

Re: Mahalanobis distance in JMP differs from other methods

AT — Sun, 28 Jan 2018 00:16:27 GMT

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

Re: Mahalanobis distance in JMP differs from other methods

David_Burnham — Mon, 29 Jan 2018 03:13:23 GMT

More dodgy maths from Genichi Taguchi?