Posted by
Jeff A on
URL: http://spssx-discussion.165.s1.nabble.com/Multivariate-Normality-Test-in-SPSS-tp5740466p5740470.html
Interesting quote by Box - I have that one saved. Interesting to me how many
folks seem to mistakenly believe that IVs and DVs have to be normally
distributed for OLS regression, that missing data have to be MAR, and I
don't know how many other similar things that are misleading at best and are
often just simply wrong. I just questioned a grad student of mine who
performed some complex transformation of a variable and did some complex
thing that was very difficult to follow just to get results that were nearly
the exact same thing as simple OLS with variables in the original metric
when the discussion of the findings was to simply note whether something was
positively or negatively related to the outcome.
Jeff
-----Original Message-----
From: SPSSX(r) Discussion <
[hidden email]> On Behalf Of Bruce
Weaver
Sent: Thursday, April 22, 2021 10:59 PM
To:
[hidden email]
Subject: Re: Multivariate Normality Test in SPSS
The official answer from IBM (as of April 2020) appears to be NO.
https://www.ibm.com/support/pages/does-ibm-spss-statistics-offer-test-multivariate-normality
Why do you want to test for multivariate normality? If you're working with
real world data, approximate normality is the best you can hope for in any
case--at least if you believe what George Box famously said about the normal
distribution.
"In applying mathematics to subjects such as physics or statistics we make
tentative assumptions about the real world which we know are false but which
we believe may be useful nonetheless. The physicist knows that particles
have mass and yet certain results, approximating what really happens, may be
derived from the assumption that they do not. Equally, the statistician
knows, for example, that in nature there never was a normal distribution,
there never was a straight line, yet with normal and linear assumptions,
known to be false, he can often derive results which match, to a useful
approximation, those found in the real world."
http://mkweb.bcgsc.ca/pointsofsignificance/img/Boxonmaths.pdf3J LEMA wrote
> How can we test multivariate normality in SPSS?
> Any suggestions?
>
> Thank you. Regards.
>
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